I believe the key number is a "CH-751 this is a generic key that FR uses for the storage compartment on all of there campers.
I changed mine out, I went to Lowe's and bought them. Make you buy the long cylinder type. This "CH-751 key also unlocks a standard out door propane storage cage.
I see that someone mention that their locks had pins in them, well they are not round steel pins, they brass disc pins. Disc pins are flat and easy to damage. These locks are also known as furniture locks but with a sliding cover over the key way to keep dirt out.
If you have a lock that keeps turning and does not lock or unlock there is a problem, at the other end of the cylinder there is what is called a cam, if the cam breaks the cylinder will spin 360 degrees and does nothing. The cam is what locks and unlocks the lock.