Anyone wishing to replace the infamous 751 lock and key system....
I found a supplier to the gaming industry that has 7 pin tubular locks/keys that will work on RV cargo doors. Cost was less than $10/per lock and key. You can get any quantity keyed alike. One drawback tho'....the key cannot be removed from the lock when in the unlocked position. 1-1/8" is an exact replacement size.
www.happ.com 888 289 4277 The folks were a pleasure to deal with.
Regards
Gemstone