almost 10 years ago my mother paid around 900 to have the ac compressor done in her van (I think the shop took advantage of her) and it was r134a. it ended up failing 3 years later. 600 sounds about right, (i thinks its a ripoff) but for someone who cant do this work themselves it gets pretty costly.

back to your question, I have an old ac compressor off a g54 that i will check with my pickup. ill let you know sometime tomorrow.