Well I couldn't make the JBL 6 1/2" work. If I used spacers then they would have bulged out the door cards.
I ended up switching to Kicker 5 1/4" and they fit perfectly. I did drill 4 new holes so the speaker would be centered in the hole. No biggie.
I highly recommend getting the wiring "harness" Metra part # 72-5510. It's just adapters to use the plastic OEM wire connectors. It made it a "plug-n-play" install for my '87. It sure beats soldering.
Crutchfield included them for free with my speaker purchase.
And I would also recommend foam baffles. They separate the speaker's air from the inside of the door cavity as well as acting as a soft gasket between the metal speaker cage and the door metal.
I didn't expect much improvement over the 35 year old paper speakers and cheapo replacement deck that were in it. And it wasn't a huge improvement. You're not going to get bass out of a 5 1/4" or 6 1/2" cone. But these sound pretty tight and are a definite improvement.
A new deck and a subwoofer (+ amp.?) should make it very nice with these 5 1/4" in the doors. But I've got more important things to spend $ on right now. Like $5.20/gal fuel. :-(
