the "stick" or "tongue" on the lock is definitely not like my original. The stick your looking for will have one corner of the 4 sides flattened down to fit into the rear door latch.
I do have a rear door latch but really hate to part with it when I bet all you need is the "stick" from an original and it's work like Tim suggested.
I might add that even with the correct "stick" it does not protrude into the actual lock mechanism very far.....just enough!

Also, work your latch over pretty good to where all the moving parts will move nice and smooth. A little grease won't hurt.

If you do not find a "stick" we MIGHT do some haggling on the lock I have. And yes, it has new keys cut for it.
If we do any haggling it'll have to be by PM or the moderator will kick out butts out of this thread! hehehe

Here is a pic of mind.
http://i140.photobucket.com/albums/r19/LutherParris/52Panel/Barndoorstuff002.jpg

http://i140.photobucket.com/albums/r19/LutherParris/52Panel/000_0161.jpg


1937 Chevy Pickup
In the Gallery
1952 Chevy Panel
In the Gallery
More photos
1950 Chevy Coupe
Pictures!

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile