will these fit our trucks??

[88GMCtruck]

^ that is in the right ballpark for sure. It entirely depends on the wheel/offset. And many wheels have a drop center, so some might be "smaller" inside the back of the rim than others. Another thing is there are different calipers on the front of some trucks, nothing major but IIRC the heavy suspension F44 truck had a different caliper. And various foundries might have the same caliper with a slightly different casting.

I would be willing to bed those, if they are OEM gm rally's would fit not problem.