[Stocker]

Per my notes from a couple years ago when I had a shop resurrect my factory A/C system:

R12 takes 3.75# (60 oz) + 10 oz oil.

R134a takes 80% of the R12 amount, so 48 oz.

That's all the info I have..... hope it helps.

I went with R134a, but these things were designed to use R12, and I understand it cools better. Since you have a source, that's probably the best choice.