Finish off your classic Chevy or GMC four-wheel-drive truck with our 4x4 center cap inserts, designed for use with original or reproduction GM Pickup Rallye center caps. The 3-1/2-inch diameter insert fits six-lug GM Pickup Rallye center caps. This 4x4 emblem insert has an adhesive backing, making installation simple and fast. You will need 2 inserts for a complete set, as the front caps do not have an insert.