Ok this is helpful, but to the basics.

I have a 1980 240D. The compressor was declared dead by an A/C shop. Dirty front shaft is one clue, no pressure in system is another.

I have ordered a new R4 compressor and have been looking for a deal on a drier and expansion valve.

Sounds like I need to flush system first. What do I use, where do I find it, and how do I go about it.

What about seals and valves? I intend to go to r134. I can let the A/C shop do it if I need to.

Final fill up will be at A/C shop, after he does leak test. I want to have as much done as I can B4 I take it in.

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69 220D not running
79 240D parts car
80 240D Beater runs everyday
81 300TD temp disabled cooling problem
82 300SD sweet