I know that it can be done because I did it. My 57 1/2 ton had the bumpers in the bed when I bought it. I just bolted them on and didn't realize that the front was upside down until an older bolter kindly told me about it. As mentioned,checking out a picture should show you the correct way although I've seen a lot of things in the magazines such as fender emblems put on backwards on so called restoration jobs so maybe check out a few sources first. Good luck.

Larry