I replaced the door lock in my '64 D model using an off-the-shelf "cabinet" lock:

http://www.cessna150152.com/forum/ubbthreads.php?ubb=showflat&Number=186649#Post186649


-Kirk Wennerstrom
President, Cessna 150-152 Fly-In Foundation
1976 Cessna Cardinal RG N7556V
Hangar D1, Bridgeport, CT KBDR