Okay, so I'm considering tackling the A/C system. Found two leaks identified by dye: one at the schrader valve -- easy replacement and another at the back of the compressor which seems to be coming from where the hoses connect to the compressor. Here's what I know about my A/C system:

It worked last year but not anymore.
Converted to R-134A within the last seven years.
Drier is fairly new and I never noticed any bubbles in the system at all last year.
Compressor is R-4 and looks original.
Hoses too, look original.

What I am considering doing is pulling the hoses and having them rebuilt by a local hydraulics shop because I think the high side hose is leaking at the crimp between the rubber and metal connection behind the compressor. Then I want to replace seals and recharge.

My question is, can I replace the seals I see as leaking and get away with it? And, what color seals do I need to use considering I will be recharging with R134A?

Thanks for the help, guys!

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1983 300CDT -- 177K