I replaced mine in the parking lot of Pep Boys on my 90 Amigo. Funny story actually, I'll give you the quick version. Front right tire broke all the studs and flew off the vehicle on the highway. Called up Pep Boys and asked if they could do a stud replacement same day, they said sure, but I'd have to get them the studs. So I had it towed there and got a ride to the Isuzu dealership for the studs, back to Pep Boys, then back to work. Got out of work, got back to Pep Boys, the truck was still outside. They said they'd bring it in right away, so OK, fine.

They get it inside, and they're like, "Oh, this is 4WD. We can't do this today..." And I'm like "WTF??? So gimmie the damn studs back, I'll do it myself." So I went out to the parking lot, broke out the tools, and did the whole replacement (did both sides, what the hell) in the parking lot of Pep Boys.

The manager came out at some point and told me I couldn't work on my truck there. I explained the situation that I was driving to North Carolina the next day (Uwharrie) and HIS company was the one that screwed me in the first place. He still said I couldn't do it, so I told him, "Well, the only way you're going to stop me is to pry the tools out of my cold dead hands, and since I have a whole box full of tools here which can be used as handy weapons, I don't think that's a very good idea." He left me alone after that. <img src="/forums/images/graemlins/smile.gif" alt="" />

If I told ya the whole story, it would be a lot funnier, but you get the point... Anyway, back to the topic, this was like 4 years ago, but neither Pep Boys nor Autozone had them in stock, had to go to the Isuzu dealer to get them. Dunno if that's changed over time, and I honestly don't know if whatever is listed for the Rodeo/Trooper would work...

HTH,
Chris