I pulled these #'s off of the pure polaris parts site...I assumed you have the xtra-lite 151"?
7041856-067 SPRING-TORSION.359SQ85°,LH,BLK (.359/85)
7041857-067 SPRING-TORSION.359SQ85°,RH,BLK (.359/85)
7041629-067 SPRING,LH,TORSION,BLK. (.359/77) 1
7041630-067 SPRING,RH,TORSION,BLK. (.359/77) 1
7041631-067 SPRING-TORSION,.375/77°,LH,BLK (.375/77)
7041632-067 SPRING-TORSION,.375/77°,RH,BLK (.375/77)