Lucas Classic Tire….online.
Has these tires on hand. $119.
I have bought tires from them for both the Model A….
As well as our TR3. Found them to be good to deal with.
I don't know about Vietnamese Model A tires, but I bought a set of Vietnam clinchers for my '22 Model T some years ago and after 2 years the sidewalls were so cracked that I had to replace them. Hopefully they're making better tires today.
I always had good luck with the southeast Asian tires.A tire shop owner told me it was because they came from real rubber country,with less petrolium content than other places.I always felt that they were softer,and probably wore faster.I'm sure there are helicopter and fighter pilots that can tell you of the frustration of having to avoid the Michelin rubber plantations scattered around the region.They were off limits.I have some 40 year old Insa's from South America that have no cracks,and are still soft and pliable.