the GMC grill requires more holes than the Chev outside of the actual grill opening, where the parking light 'extensions' wrap out around the front, don't know if it uses all the Chevy mount holes, but should hide them .... I think most of Dynacorns parts are stamped offshore, but they came up with good GM specs to work from and seem to 'police' their contractors pretty well, the parts are much superior to the run of the mill Chinese parts
Bill