I took the truck in to have them replace the starter motor. it's a '95, so it needs to be accessed from underneath with a lift. I left the truck at the garage for the two hours that they said it would take, but when I got back, they had busted off two of the mounting bolts and mysteriously "lost" the third. The kid that was working on it said that the bolts broke because they were aluminum, so they were going to have to drill them out carefully. I could see that they had already tried drilling, but the dimple from the drill bit looked as if the bolt had been made of steal because it was more warn than drilled, as if the metal were much harder than aluminum. I'm pretty sure these guys are pulling my chain, they f***ed up and their trying to get me to pay for it. But I was just wondering if anyone could tell me what the bolts they use to mount the motor were made of. Thanks for your help.