I have a set of 18RC extractors for sale, re-conditioned carby, a/c unit and the block (the block will go for about $50 with only 170,000 km on clock, but needs work)
Private message me if you are interested and i will tell you more
I doubt it because the Air Conditioning is generally on the other side on an 18RG. I do have an 18RG air conditioning unit as well. This is just the unit itself, so it is not complete. but would probably be the only part that you would have trouble finding (ie tubing and electronics shouldn't be a problem). I can sell the unit for $20.