I've got a used '94 that works well--I just replaced it last year with a new one for about $400. I did this when I was brand new to the AS world and had a leak. The leak was not the water heater--it was the gray water valve.
Anyway, you're welcomed to it--it's sitting in the garage, and I'd bet it would fit right in with your current slot. This one's from a '94 30' Excella 1000.
'94 Excella 1000; '03 Silverado 2500HD