These springs are specifically made for the 2016-20 RZR Turbo, RS1, 2024 and newer RZR 1000 and Xpedition drive clutches with no modifications required to the stock spider assembly. They must be used in conjunction with the SLP spring spacer part #50-353. Compression Rate is measured in Pounds @ 2.25" and @ 1.25". Sold per each. Will not fit RZR Pro XP/XP-4.