Casey from SWISCO responded:
August 18, 2023
It looks like you have an older version of the 15-251 single support, which uses the 1/2" thick S160 coil springs. The 9.0 stamp on your part indicates that you will need one S160-9 coil spring on each side. We also offer the 16-031 mounting bracket shown below. Take a look and compare the specifications to yours. Thanks for posting! Measurements of 15-251
Dimesnions for 16-031
|