Honda Original Equipment Muffler Gasket - 18381-ZH8-801
This part fits;

EB2500C AG - EZGN 1000001-9999999 - CYLINDER HEAD
EB2500XK1 AG/A - EZCP 1000001-1018062 - CYLINDER HEAD
EB2500XK1 AG/B - EZCP 1018063-1079999 - MUFFLER
EB2500XK1 AG/D - EZCP 1080001-9999999 - MUFFLER
EB3000C AG/A - EZGP 1000001-1001374 - CYLINDER HEAD
EB3000C AG/B - EZGP 1001375-1099999 - CYLINDER HEAD
EB3000CK1 AC - EZGP 1130001-9999999 - CYLINDER HEAD
EB3000CK1 AG - EZGP 1100001-1129999 - CYLINDER HEAD
EB3000CK1 AG/A - EZGP 1130001-9999999 - CYLINDER HEAD
EB3000CK1 AN - EZGP 1130001-9999999 - CYLINDER HEAD
EB3000CK2 A - EZGP 1500001-9999999 - CYLINDER HEAD
EG1400XK1 A/A - EZCJ 1000001-1018788 - CYLINDER HEAD
EG1400XK1 A/B - EZCJ 1018789-1039999 - CYLINDER HEAD
EG2500XK1 A/A - EZCR 1000001-1067439 - CYLINDER HEAD
EG2500XK1 A/B - EZCR 1067440-1119999 - CYLINDER HEAD
EG2500XK1 A/C - EZCR 1120001-1123343 - CYLINDER HEAD
EG2500XK1 A/D - EZCR 1123344-9999999 - CYLINDER HEAD
EG2500XK1 AC - EZCR 1120001-9999999 - CYLINDER HEAD
EG2500XK1 AN - EZCR 1120001-9999999 - CYLINDER HEAD
EM1800XK1 A/A - EZCK 1000001-1011298 - CYLINDER HEAD
EM1800XK1 A/B - EZCK 1011299-1039999 - MUFFLER
EM1800XK1 A/C - EZCK 1040001-1040009 - MUFFLER
EM1800XK1 A/D - EZCK 1040010-4999999 - MUFFLER
EM2500C A - EZGK 1000001-1000013 - CYLINDER HEAD
EM2500XK1 A/A - EZCN 1000001-1036738 - CYLINDER HEAD
EM2500XK1 A/B - EZCN 1036739-1109999 - MUFFLER
EM2500XK1 A/C - EZCN 1110001-1110313 - MUFFLER
EM2500XK1 A/D - EZCN 1110314-9999999 - MUFFLER
EM3000C A - EZGL 1000001-1009364 - CYLINDER HEAD
EU3000I AC - EAVJ 1000001-9999999 - MUFFLER
EU3000I AN - EAVJ 1000001-9999999 - MUFFLER
EU3000I AN8 - EAVJ 1000001-9999999 - MUFFLER
EU3000IK1 A - EAVJ 1100001-9999999 - MUFFLER
EU3000IS A - EZGF 1000001-1499999 - CYLINDER HEAD
EU3000IS A/A - EZGF 1080001-1499999 - CYLINDER HEAD
EU3000IS AC - EZGF 1080001-1499999 - CYLINDER HEAD
EU3000IS AN - EZGF 1080001-1499999 - CYLINDER HEAD
EU3000IS1 A - EZGF 1500001-1699999 - CYLINDER HEAD
EZ1400 A - EZEY 1000001-9999999 - CYLINDER HEAD
EZ1400 A - EZEY 1000001-9999999 - GASKET KIT
EZ2500 A - EZEJ 1000001-9999999 - CYLINDER HEAD
F401K2 A - FZBL 1000001-1099999 - MUFFLER
F401K2 A2 - FZBL 1000001-1099999 - MUFFLER
F401K2 AC - FZBL 1000001-1059999 - MUFFLER
F401K2 AC/A - FZBL 1060001-9999999 - MUFFLER
F401K2 AC2 - FZBL 1000001-1099999 - MUFFLER
F501K2 A1 - FZAZ 1000001-1099999 - MUFFLER
F501K2 A2 - FZAZ 1000001-1099999 - MUFFLER
F501K2 AC1 - FZAZ 1000001-1049999 - MUFFLER
F501K2 AC1/A - FZAZ 1050001-1053188 - MUFFLER
F501K2 AC1/B - FZAZ 1053189-1199999 - MUFFLER
F501K2 AC2 - FZAZ 1000001-1099999 - MUFFLER
FC600 A - FAMJ 1000001-9999999 - MUFFLER
FC600 AC - FAMJ 1000001-9999999 - MUFFLER
FC600 AN - FAMJ 1000001-9999999 - MUFFLER
FR600 A - FZAV 1000001-1999999 - MUFFLER
FR600 AC/A - FZAV 1000001-1999999 - MUFFLER
FR600 AC/B - FZAV 2000001-2009999 - MUFFLER
FR600 AC/C - FZAV 2010001-2010383 - MUFFLER
FR600 AC/D - FZAV 2010384-2099999 - MUFFLER
FR650 AC - FZBV 1000001-9999999 - MUFFLER
FR750 AC - FZCG 1000001-1019999 - MUFFLER
FR750 AC/A - FZCG 1020001-9999999 - MUFFLER
HS621 A/A - SZAN 1000001-1038238 - MUFFLER
HS621 A/B - SZAN 1038239-1099999 - MUFFLER
HS621 A/C - SZAN 1100001-1129999 - MUFFLER
HS621 A/D - SZAN 1130001-1130378 - MUFFLER
HS621 A/E - SZAN 1130379-1999999 - MUFFLER
HS621 AS/A - SZAN 1000001-1038358 - MUFFLER
HS621 AS/B - SZAN 1038359-1099999 - MUFFLER
HS621 AS/C - SZAN 1100001-1129999 - MUFFLER
HS621 AS/D - SZAN 1130001-1130378 - MUFFLER
HS621 AS/E - SZAN 1130379-1999999 - MUFFLER
HS622 TA/A - SZAL 1000001-1099999 - MUFFLER
HS622 TA/A - SZAL 1000001-1099999 - GASKET KIT
HS622 TA/B - SZAL 1100001-9999999 - MUFFLER
HS622 TA/B - SZAL 1100001-9999999 - GASKET KIT
HS724 TA - SZBE 1000001-1029999 - MUFFLER
HS724 TA/A - SZBE 1030001-9999999 - MUFFLER
HS724 WA - SZBE 1000001-1029999 - MUFFLER
HS724 WA/A - SZBE 1030001-9999999 - MUFFLER
WB20XK1 AC1 - MUFFLER
WB20XK1 C1 - MUFFLER
WB20XK2 A - WABT 1000001-1999999 - MUFFLER
WB30XK1 AC1 - MUFFLER
WB30XK1 C1 - MUFFLER
WB30XK2 A - WACT 1000001-1999999 - MUFFLER
WD20XK1 AC1 - MUFFLER
WD20XK1 AC1/A - MUFFLER
WD20XK1 C1 - MUFFLER
WD20XK1 C1/A - MUFFLER
WD20XK1 C1/B - MUFFLER
WD30XK1 AC1 - MUFFLER
WD30XK1 AC1/A - MUFFLER
WD30XK1 C1 - MUFFLER
WD30XK1 C1/A - MUFFLER
WDP20X A - WZBZ 6000001-9999999 - MUFFLER
WDP20X A - WZBZ 6000001-9999999 - GASKET KIT
WDP20XT A - WZBZ 6000001-9999999 - MUFFLER
WDP20XT A - WZBZ 6000001-9999999 - GASKET KIT
WDP30X A - WZCA 6000001-6100000 - MUFFLER
WDP30X A - WZCA 6000001-6100000 - GASKET KIT
WDP30XT A - WZCA 6000001-6100000 - MUFFLER
WDP30XT A - WZCA 6000001-6100000 - GASKET KIT
WH15XK1 AC1 - GC01 2000001-4299999 - MUFFLER
WH15XK1 AC1/A - GC01 4300001-9999999 - MUFFLER
WH20XK1 AC1 - GC02 2000001-8669999 - MUFFLER
WH20XK1 AC1/A - GC02 8670001-9099999 - MUFFLER
WH20XK1 AC1/B - WASJ 1000001-9999999 - MUFFLER
WMP20X A1 - WMP20X 1000001-9999999 - MUFFLER (STANDARD)
WP20X ACF6 - WZBE 1000001-1399999 - MUFFLER
WP20X ACF6/A - WZBE 1400001-9999999 - MUFFLER
WP30X ACF6 - WZBF 1000001-1299999 - MUFFLER
WP30X ACF6/A - WZBF 1300001-9999999 - MUFFLER
WT20XK2 AC - GC02 2000001-8669999 - MUFFLER (WT20XK1/K2/K3/K4)
WT20XK3 AC - WAAJ 1000001-1009999 - MUFFLER (WT20XK1/K2/K3/K4)
WT20XK3 AC/A - WAAJ 1010001-1013491 - MUFFLER (WT20XK1/K2/K3/K4)
WT20XK3 AC/B - WAAJ 1013492-1099999 - MUFFLER (WT20XK1/K2/K3/K4)

This is an OEM Honda part.

Thank you for looking!