Leak in Low Side A/C Service Port, Part # Help Please
 

On a 93 XJ6, the refrigerant is leaking out of the low side service port. It looks very different from the service ports I am used to in my Toyota Supra and Celica. It is apparently a ball type valve.
What is the proper part # to order and where can I purchase this valve?

I took it off and NAPA matched up one for me with a Shrader valve instead of the ball valve.