This is a CUb cadet spring 732-3115. It fits 

Cub Cadet 2130 (135-212F100, 134-212F100) - Cub Cadet Lawn Tractor (SN: 239,001 - 326,005) - 38" Spindle Assembly
Cub Cadet 2130 (13B-212F100, 136-212F100, 13A-212F100) - Cub Cadet Lawn Tractor (SN: 326,006 & Up) - 38-inch Deck Assembly S/N 359000 & Below
Cub Cadet 2135 (135-214F100, 134-214F100) - Cub Cadet Lawn Tractor (SN: 239,001 - 326,005) - 38" Spindle Assembly
Cub Cadet 2135 (135-214F100, 134-214F100) - Cub Cadet Lawn Tractor (SN: 326,006 & Up) - 38-inch Deck Assembly Serial No. 359001 And Above
Cub Cadet 214 (190-214-100) - Cub Cadet 42" Mower Mfg. Date H 179 & After - 42" Deck Assembly
Cub Cadet 2140 (134-232G100, 135-232G100) - Cub Cadet Garden Tractor (SN: 239,001 - 326,005) - 42" Spindle Assembly
Cub Cadet 2145 (134-234G100, 135-234G100) - Cub Cadet Lawn Tractor (SN: 239,001 - 326,005) - 42" Deck Assembly
Cub Cadet 2146 (13A-224F100) - Cub Cadet Lawn Tractor - 38" Deck Assembly
Cub Cadet 2150 (136-242G100, 13B-242G100, 13A-242G100) - Cub Cadet Lawn Tractor (SN: 326,006 & Up) - 42-inch Deck Assembly S/N 359001 And Above
Cub Cadet 2155 (13A-244G100, 13B-244G100, 136-244G100, 13C-244G100) - Cub Cadet Lawn Tractor (SN: 326,006 & Up) - 42 Spindle Assembly SN 359001 And Above
Cub Cadet 2164 (13A-264G100) - Cub Cadet Lawn Tractor - 42" Spindle Assembly
Cub Cadet 2166 (13A-214G100, 13A-254G100) - Cub Cadet Lawn Tractor - 42" Spindle Assembly
Cub Cadet 2176 (13A-274G100) - Cub Cadet Lawn Tractor - 42" Spindle Assembly
Cub Cadet 301 (190-301-100) - Cub Cadet 48" Mower Deck - 48 Inch Spindle Assembly
Cub Cadet GT2542 (14A-2D2G710) - Cub Cadet Garden Tractor (2008 & Before) - Deck Assembly 42 inch
Cub Cadet GT2542 (14A-2D2G010) - Cub Cadet Garden Tractor (2009 & After) - Mower Deck 42 Inch
Cub Cadet LT2042 (13A-286G710) - Cub Cadet Lawn Tractor - Deck Assembly 42 inch
Cub Cadet LT2138 (13A-214F710) - Cub Cadet Lawn Tractor - Deck Assembly 38-inch
Cub Cadet LT2180 (13A-254G712, 13A-254G710) - Cub Cadet Lawn Tractor - Spindle Assembly 42-inch