[RichardJ]

I ran into that problem finding a pump for my inline six about 5 years ago. I think the tab is made of a metal that is more compatible for a pump arm that runs directly on the camshaft. After a lot of searching, I found a Airtex pump that had the tab. Unfortunately, I bench tested it and found it wouldn't hold pressure when hand pumped. I got a carter from NAPA and it has worked fine. Tab or not, nothing has worn out yet.