why cant you find a body lift? it is actually pretty much universal. you can do it the canadian way, and use hockey pucks. im not totally sure, but the 31's will fit. but the 12.5? why that wide? im again, not totally certain, but 12.5 will rub like nuts. for the body lift, figure out how many body mounts you need, and find a kit that has that many, and go at er. are you sure that its not a suspension lift you are thinking of? try harder to search, because you wil probably find what you are looking for. good luck. ohh, and if you are at al welding and machining wise, you can custom make your own body spacers out of aluminum with a hole drilled in the center with a lathe. either way man, i am in the same boat as you with the saggy runner. im just gonna add a leaf.