A/C Compressor went out

[tucsonjwt]

So, I have choices. Reman or new, AC Delco or Four Seasons, old style or new "S6 style", non-switch type or not, 5" or 5.12" diameter pulley.

Has anyone tried the new S6 in place of the A6? They are lighter but I don't know anyone who has used one.

How do I know if I need a non-switch type (I assume this means non-pressure switch type.)

I have had no luck with reman a/c compressors in the past.

Is it true that the old tube and fin condensors should be replaced with a new a/c compressor, or can they be adequately flushed out?

How do I know if I have a 5.12" diameter pulley? I am not sure exactly what the proper measurement location is, and I don't know if I can trust my tape measure to be accurate to 1/8" using my eyeball.