Hello guys, I'm new to this site. Just have a question about toppers for GMC Seirras. We (my family) have to move my sister to calgary and all the u hauls are rented when we're going to need it. Just wondering what years the toppers switched. My dad has a 2004 and trying to find out which ones would fit. There is one locally here for a 93, how much difference is it, and would we be able to use it with maybe some minor mods. Any help would be appreciated. Thanks, John