dual coil springs

Hello! The 15-199 is designed to be compatible with two different sized springs: the 1/2" thick Series 160 and the 3/8" thick Series 165. You didn't mention the size of your original spring, so look these two other to determine the better match.

For a double support, I'd recommend the 15-150D if you have the Series 160 or the 15-204 if you have the Series 165.