What do mean by rebuid kit. If what you need are the kit with springs and pins, call Randy's Ring and Pinion. They'll get you hooked up. If you need side gears and couplers, you'll have to talk to Eaton/Powertrax about replacement parts.
I just got a lockrite for my 8.25 off ebay for 50 bucks and it didnt come with springs or pins. I called up richmond gear (lockright) and told them i bought a lockrite and it didnt come with springs or pins. If you just kind of make it sound like you bought a new one and it didnt come with them they will send you a new set for free.