I agree. Haven't seen any plastic tabs. From what I have seen they all have the tab. It's just that some are bent and some are not. Back in the day we used to see quite a few with the tab bent in a way that didn't let the secondaries open all the way. It was the very first carb trick I learned from my older cousins. They always looked for the tab and bent it like the one in the auction. I'm sure we bent dozens of these. There were quite a few applications that the carb tab needed bending to get the most out of the carb.... Now, on the other hand, I've heard tell of people bending this tab in a way to STOP the secondaries from opening all the way. When people used these cars for daily drivers it made the 4 barrel into a stingier carb than the two barrels were. So, there's bound to be some confusion and many many altered tabs out there.