If you interpreted my response as a challenge to your knowledge, that was not my intent. I tried to find a listing for BBP 10 x 1.75 drums or shoes for 73+ A-bodies as well as F, M and J bodies and had no luck. As I was looking, I got a message from another forum and I simply shared it to see if anyone from FABO could corroborate it. I have since been able to confirm that the '69 Coronet with /6 was available with 10 x 1.75 drums on the front, still available as Bendix PDR0018 which share the same critical measurements as what I have here.
I'm just a dude trying to piece together a solid driver on a budget.
Peace