AC Chassis part numbers 2003 Itasca

[Blkbart]

I have a 2003 Itasca 34HD - it has the Freightliner chassis and a 330HP CAT.
Looking for some part numbers. Looking to replace the expansion valve and the receiver dryer as I go through the system, after all it is 16 years old. The AC doesn't blow as cold as it should. The R134 high side pressure is too high but lowers back down as the RPM increases. Initially the condenser was super dirty and about 25% clogged up, cleaned it up and replaced the two fans. This made it much better. While I go to evacuate the system I want to replace two the items listed above. From what I have researched, the receiver dryer seems to be generic.
One person recommend I replace the compressor? It spins freely (not frozen up or noisy and the coach has 62K on it. Any ideas, part numbers, personal experiences would be appreciated.
Thanks

[be happy]

Have you tried here Parts Catalog
being a new 07 Meridian owner I have found this helpful.

[Blkbart]

Thanks for the link . I did find the part number for the receiver drier (54-10001 or 54-100011) and found them online. Quite a variance in the pricing, $27 - $88. As for the expansion valve I used the part number off of the original unit 126 830 0384. Beginning to realize the tremendous issues of buying an older coach even when it looks cosmetically impressive inside and out