I finally got around to cross part numbers between the four divisions to see how much interchange there is for non A/C parts. From this there is some good news, the duct work is the same. The parts that'll be dash specific is the vent cables & the center vent adaptors. Now the Olds has a passenger side vent adaptor & has a note the integral defroster duct (10000468) has a knock out in that area. I'll include the GMPartsWiki link from using p/n 10000468 for the search. If anyone ever wonder, the heat only RPO is C41.
