AC gurus -

I have read through all the threads and I'm aiming to hook up my welding gas cylinder to pressure test my AC system.

My question is: What connection do I get to go from the AC hose (R12 flared fitting) to the gas regulator - 1/4 straight threads.

Grainger / McMaster etc. give me no options.

Help :-) I'm trying to do it right.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car