remember I'm old and forget allot but I'll have to look I don't recall the 501 being on the list you sent me the 403 being the longest but I could be wrong now I'm probably going to change to the 501
Ok found out that I'm old and forget allot proof being that I was mistaken about the 501 Qa1 suggest using the 325 spring with the 501 shock and I was guessing around 1600 # front weight looking like I'll be switching over to the 501 due to the 13 1/4 ride height being the lowest I would care to go and I can go up to help with leveling out the car as long as it looks ok