Shrink tubing and solder took care of wiring the parking light sockets to the harness. Even though the ones I got were from a '68 GTO, the wire color codes were the same as Firebird.
The reproduction parking light housings and lenses are a real challenge to install. We spent five hours today trying different things to get a decent fit into the openings on the body. Both sides fit poorly even after enlarging the holes in the housings and the lenses. This is a case where original pieces would have been a boon!!