i replaced both of mine with aftermarket from year-one. they are coupe quarters but, my body guy said the fit was great. and they do look great installed. year-one part # KQ468LH for left & KQ468RH for the right @ $139.00 each. or the pair KQ468LHRH @ $265.00 these are quarter skins, not quarter panels.
year-one has a good tech department also and can answer most questions you might have, and they aren't too lazy to go back to the warehouse and make comparisons between parts. year-one 1-800-932-7663
NPD also carries a quarter skin. but i have not seen these. they are not as expensive and since npd has a depot in michigan, it will save some serious $$$$ on shipping. npd part # c-12940-233a (right)@$114.50 & c-12940-224a (left)@$114.50 npd 1-800-521-6104
I am sure that you have been looking at EBAY and Hemmings. I actually found a guy (word of mouth) who sold me a new NOS 400 Hood and NOS rear quarters. The funny part was that the guy had these stored in a garage about 5 blocks from my house.
1967 400 Convertible 1978 Firebird 1980 Trans Am Pace Car (Sold) 2002 Ram Air Convertible (Sold) Mike
This was a few years ago. I had been lookedfor for the guy a few times since. Seems to have disappeared. Although I got lucky as you said, I did pay $1250 for the hood.
1967 400 Convertible 1978 Firebird 1980 Trans Am Pace Car (Sold) 2002 Ram Air Convertible (Sold) Mike