All the information you could ever desire is held on these previous forum threads. Just do a search of this forum using the keywords SouthCo latch:
Source of basement door latches and holder upper things
Cargo bin latches
Broken Cargo Latch
Outside Compartment Locks
To add to your edification, here is the spec sheet for your replacement lock:
dwkerch's message is, of course, irrelevant to to an Alpine. However, Tri-mark locks are used on the front doors of our coaches. The doors are manufactured and parts available from PTL Engineering (more information available via a forum search).