:rant: Hhmmmm .... You might be SOL at finding them at NAPA or any local parts store but it's worth a shot. This is what you want.
>>BUMPSTOPS<< The flat hard urathane style.
These bumpstops are on a single threaded stud. Your stockers are rivited to the frame above the rear axle and lower control arm in two spots each per bumpstop.
On the rear lift your truck up by the frame and let the suspension hang. Take off the rear wheels. Grind off the heads of the bumpstop rivits from below and thack it with a hammer to get it off. With the suspension hanging it will give you just enough room to drill the single hole required for the new bumpstops on each side.
On the front jack your truck up and do the same. I had a small die grinder to shave off the rivit heads from below. They are recessed in the lower control arm a bit so it's a little tough to get at them with a full size grinder. Can't recall but you might be able to get at them from the top of the A-arm but I don't think so. Anyway, once there off, again drill one hole each per A-arm to mount the new stops.
You might want to try these guys since there in Canada. I've dealt with them before on a lot of stuff and there pretty good.
http://www.superbee.ca/ If not, any custom parts store should have them or be able to get them.