I have both, I don’t think they’re particularly hard to find. The system is 3 separate pcbs that connect, so if you want it in a cab you’d just secure it all ahead of time. I don’t run them in the original cab.
You can also rom/chd swap some other titles on the system, but there’s really “Vegas” and “Durango” titles. If I recall @SummittArcade has security pics for sale unless he ran out.