Recommendations for IMSAI-compatible RAM cards?

Hey all -- Acquired an IMSAI 8080 in half-assembled condition (but the price was right). I believe that (after doing some thorough cleaning, debugging, and replacing of old cabling) that I've got the front panel and CPU functioning correctly. However, the IMSAI came without any RAM cards so I'm unable to go any further at the moment. I have one S-100 RAM card but I have no documentation on it and it's missing a couple of ICs (and what they're supposed to be, I don't know). It's a PSS RAM65. My internet searches for info confirm that the card does indeed exist, but I can find no technical information. From my research, my understanding is that S-100 RAM cards are fickle and compatibility with front-panel machines can be an issue. Does anyone have any recommendations for what to look out for as I begin my search? Anyone have any decent RAM cards they'd be willing to part with? Thanks! Josh