Early A boidy door/ignition lock sets

That's a difficult and costly lock set to find these days. Occasionally they go by on eBay, or from one of the "usual suspects" in overpriced maybe-you'll-get-it, maybe-it'll-be-as-described NOS parts (such as the outfit in Georgia or the one in Washington). Interchange is '60-'65 A-body plus '62-'65 B-body.

Unless you're building a 100-point trailer queen, I'd simply enlarge the door lock holes and install the easy-to-buy, inexpensive, more-secure, easier-to-rekey '66-up door locks.

The ignition lock cylinder is still easy to buy; it's the same through '68.