One reason that people aren't posting suppliers for X-in-1 boards is that they run unlicensed ROMs using an outdated/illegal distribution of MAME.
Posting links to x-in-1 boards violates
Rule 5.

Another thing to consider is that the board and wiring harness in your cab are not
JAMMA, which limits the number of plug-and-play options you have available.
If you're looking to put a JAMMA x-in-1 board in your current cab, there are two basic approaches:
1.) Carefully remove the old board/wiring harness (don't cut the harness if you can avoid doing so) and make a replacement control panel.
2.) Space permitting, leave the current board/harness as is, unplug the control panel and make a replacement for it. Mount the JAMMA board and harness where you can.
Either way, try to make any changes easy to undo in case you decide to reverse the conversion later.
Scott