Can't help you out with part numbers but I thought I would shoot my opinions out there.

I would not use Rancho's again. They just do not seem to hold up. I have broken the end off one on dirt roads and I blew one out on simmilar washboard dirt roads. Replaced them Bilsteins and they have held up very well.

Everything has taken place over the past 18 months so it is not like the shocks were that old. My local NAPA told me that this is not an uncommon story for Rancho shocks and they actually gave me my money back in credit toward the Bilsteins.

Just my 2 cents. You get what you pay for.