The compressor model number appears to be the same as '68 but the label is slightly different. The '68 has Tempest on top, then Firebird and Pontiac on the bottom. I can take pictures of mine if you would like.

Can't tell about the main bracket and muffler, looks similar. Both are unpainted/coated natural metal color on my '68.

http://www.thefirstgensite.com/library/partscounter/illustrated/heatair/air1.html