John Deere Original Equipment Compression Spring - CH13159 The part specifications for CH13159: Part Number: CH13159 Part Name: Compression Spring Wire Diameter(IN): 0.0906 Outside Diameter(IN): 1.1929 Free Length(IN): 3.1496 Spring Rate (LBF/in or N/mm)(LBF/IN): 0.0000 Solid Length(IN): 1.5748 Number of Coils(UNITY): 8.0000 Material(ALPHA): STEEL Finish(ALPHA): D - Phosphate and Oil This CH13159 Compression Spring fits these models: 1050 ( -011000) Compact Utility Tractor 4005 Compact Utility Tractor 850 ( -16000) & 950 ( -20000) Compact Utility Tractors 850 (16001-), 950 (20001-) and 1050 (11001-) Compact Utility Tractors 870, 970 and 1070 Compact Utility Tractors 990 Compact Utility Tractor This is an OEM John Deere part.