300SD A/C Recharge Question

[tekgnos]

With record breaking temps up here in Montana, its about time to get the A/C on my 85 300sd working. I had the compressor replaced during the winter and the MB shop told me that they couldn't put in 134a because they didn't know if it was compatible with the Freeze 12 that was in the system.

They did drain it, but now I need to know two things- can I put 134a on top of freeze 12? And how the heck do I get the right fiting so that the cans of 134a will fit on the correct nozzle?

-Travis