Hugh,EmTee,Fred,
Thank you all very much for your advice. Fred, thank you for the clarification on the '27 not having the hole and threaded pin. A locksmith sounds like the next viable option although I may decide just to leave well enough alone for now as it certainly is driveable in the unlocked position. I do still have the ability to lock the driver and passenger side doors with a seperate key.
Different subject: Series B AC speedometer: The trip meter knob to reset that dial to 0 now just spins without moving the dial.( it did work previously). That dial and the odometer however still both advance and record addded mileage when the car is driven but the speed function does not work.
Russ Furstnow has been very courteous and helpful in trying to find a replacement but unfortunately cannot find a good match with the bezel I need. Again, maybe I should just leave well enough alone but any thoughts on that reset knob?