Correct Door Lock for '79 240MH ???

[flatouf]

I have a 1979 24' Airstream Motorhome. My entry door currently has a Bargman L300 lock, Can somebody tell me the correct lock model for my A.S.

I can tell this is not the original lock that was once on the door, and the problem is the lock interferes with the screen door, which prevents my entry door from closing 100%.

Typically the lock body fits into the cut out on the screen door, which allows the screen door to sit flush with the entry door. The door when closed fits tight against the weater stripping.

My last three numbers on the serial are 001, if that helps.

Any help would be greatly apprecialted.

FL