If I remember right, when I had my 90 Laredo (bot new back in the day), we replaced those with metal ones off of Triumph TR 7's or some odd ball car like that. There were right size and shape and hooked right up. Made of brass if I remember. Never had a pressure leak again. Wish I was more certain, but you Renix guys might poke around some Triumph parts sources and check out what is there. Reason I am thinking that, I had the XJ and two Triumphs at the time. But that was twenty whatever years ago.