Ok, BPL nation, we have confirmed that the smokey grey bottles do thread onto the old lid. Please PM me with your requested remuneration (postage, a few bucks) and I’ll send the address. I’m asking for PM’s because I’ve gotten numerous responses, and I want to make sure I treat each one individually.
David, here’s 2 photos of the lid that is the cause of the issue.


There’s what looks to be a Neoprene seal on the inside of the lid. If that is just held in place by the nuts and compression, great. If there’s any sort of adhesive in there, I can’t be sure of prying the original seal out intact. If I’m reading the gauge correctly, it has to hold to about 100 psi. That is what has worried me about just trying to re-engineer the thing. If I don’t have it seal properly, I’m sunk.