Need Caps for '72 A/C A-Body

I need replacement pressure connector caps for my A/C in my Demon.....they're red (possibly one red, one another color....don't know what to say....missing one).........

I can't find these anywhere...........they screw on the fittings atop the compressor unit...........

HELP!! Want nice ones, or NEW / NOS......whatever.... Doc

(and which side is the high pressure?......Driver, or Passenger?) ](*,)