A/C help for a friend on a very small budget

[Worldofhurts]

I have an elderly friend who is on a fixed income. I'm trying to help him repair his Old air ac unit on his 72 C10. His compressor was going out and I'm looking for a replacement for the old air dryer and expansion valve. Dryer 21-4215A and expansion valve 25-1000 according to Old Air's website. And when I mean replacements I mean real part numbers that are for the items. I know the compressor is a Sanden "Style" 508 which I'm giving him since he has helped me out many times in the past. I'm just trying to collect the rest of the parts for him so he can keep the AC working. I have a good friend Pete from express auto that will flush and recharge the system. I Maybe wrong but I think the Dryer is an AC Delco 15-1244 and I'm not sure on the Expansion Valve but I'm open to suggestions. It's nothing against Old Air for the prices. We have purchased for my families C10s and I continue to buy from them. I'm just trying to help this old timer out and keep his truck running with spending as little as possible.. Thank you in advance for all the help.