Found me a possible truck 1971 gmc swb

[ETsC10]

Originally Posted by LockDoc

Round key for doors, rectangle for ignition is not a "GM tradition" until 1973. If you have a '67-'72 and it has them someone has changed the door locks. The ignition and doors used the same key on the '67 - '72 trucks, and they were the rectangular head ones.

LockDoc

Thanks Leon.
Yup, my Dads '71 GMC was one key...no waiting
Glove box as well? I do think his had a lock on it ...
I can't remember about the key though.