I contacted photovac and they quoted me a pretty good price, it was discounted though I am not sure why, maybe because of my work email. My friend that I got the laser from found the original RF cable and I tried that. Welp, I don't need to send it in after all.
So apparently length or type is really critical with these. The cable is 2.35m long and made with LMR-400 which I had guessed, the plenum version though. I have some of the flexible version coming tomorrow and see if that works too.