I bought those fittings from Summit, you just have to tell them on the phone what you have and they will get you the right ones. I think it was like 5 or 6 bucks for the correct fittings.
My Prop Valve came in a kit and it HAD fittings, but not the Red Threadlocker that should be on them, so being the stickler I am for details, I called Summit and asked just for those fittings and had them in 2 days!