I don't know the part number on my bumpstops. I bought my GCs though a groupdeal a while back and they came preassembled from GC. The bumpstops were already on the shocks/struts and i don't remember their being any description on the invoice other than just bumpstops, or something like that. Sorry. I'll try and find out more, although I'm sure someone else on here knows the part number, or at least the height (I forgot to measure).