It seems like if anyone here knows the answer to that, it would be Carbking.
The B that came off my truck has its tag. The tag number matches the model carb that it would have come with, and the date code matches the truck's build timeframe based on model year and casting dates I remember seeing on other parts. If you're just looking for a tag that does the same for your truck, maybe you can scour ebay or swap meets for the right model number B. Take the tag and resell the carb if you don't want/need extra parts sitting around. Or maybe someone here has an appropriate tag on a spare they'd part with.
