My'lil'truck

I have a 1992 Toyota Hilux Extended Cab 4x4. A few weeks ago I got a loud squeaking sound when I turn on the AC. Sad news, the compressor bearings are shot. So here are my questions:

I've done some research and it looks like it takes a 10PA15C compressor. The system is completely sound (e.g., still pumps out ice cold air if you ignore the loud squeaking). I have a nice vac pump that can draw the system down. Here are my questions for you AC experts:

1) What type of PAG oil does Toyota recommend?
2) What is the H/L pressure recommended at 80 degrees ambient?
3) If the system is sound can I drain, replace and recharge without replacing the expansion valve and receiver dryer?
4) If I don't flush the entire system, how much PAG oil should go in the compressor at start up?
5) I've found several sources for compressors, but the most reasonable is a Denso at Rockauto for $165 or at YotaYard in Colorado they'll ship me a used one for 60$ (40$ compressor 20$ shipping). Rockauto gives a 1 year warranty, YotaYard a 30 day warranty.

I've used used compressors before and had good luck with durability (provided I clean and lube them properly). I need to do this in the next couple of weeks before it gets hot and we head out on a week long run into the King's Peak wilderness area.

Yotard

nd 8 pag oil but check with your instructions on the new compressor to be sure. replace your expansion valve while you are at it because it will be rusty and its half an hour more work. definitely do the dryer, its 30 bucks and your old dryer is probably not drying anymore since it is 20 years old and it is just silica. If you get a new compressor, drain the oil it came with out of it and replace with exactly the same amount that came out of it. You won't over oil it doing it even if you don't clean the lines. Replace all of the orings you can wherever you opened it. Chasing leaks is a pita.