I have the pro comp series 51 rockcrawlers.

The size i have is 16X8 with the 6x5.5. For the life of me I cannot remember what backspacing they are though, and I've dug for the invoice a few times (moving sucks, you loose stuff) Though the BS is either 4.25 or 4.5. you would probably be ok with either. I just repaired a tire and meant to look but didn't. dang it

The hubs of the vx just barely fit through those wheels, and otherwise they fit fine (i am lifted, so that helps tire fit). As for the 16x7, i don't know if you can get them to fit. depends what backspacing they come in. But I'd step up to 16x8, and be able to put bigger meats on them.

I got them from http://www.4wheelcustoms.com/Products.asp?Cat=49

If you want to know what they look like check out my gallery

bob