repo u-nuts just won't work. they protrude into the cluster and glove box openings too much to allow the cluster or glove box to fit into their respective spaces. numerous vendors sell these oversize U-nuts. keep your originals when restrings these corvettes. the correct u-nuts were also used to secure the 63-4 grills to the lower and upper valences. if one uses the oversize U-nuts for grill installation, they will stick up enough for the judges to discern they are repos. mike