Take a look in our Document section. There should be a Lippert Master catalog. Find the size of your axles on your rv, they're on a tag on the axle, and look up the number in the manual.
__________________
Mark & Susan
Lehighton, Pennsylvania
EAGLE HT FIFTH WHEEL | 30.5CKTS - '13 Ford F150 SCREW - PullRite Superslide - Roadmaster Active Suspension Member - "Northeast Adventures RV Rally Group" & "Mason-Dixon Bunch"