Fuel inlet sizes on the single barrel?

[jayoldschool]

Truck died today. Started running rough under any throttle with load. While diagnosing, noticed that the fuel filter housing is stripped. Not sure if this was the problem (letting air in), but need to fix that ASAP so I can do more work.

I need one of those thread cutting fittings from Dorman/Help. Any idea what size I need? 65 C10 230 with the good old Rochester single bbl B. I have rebuilt the carb already. Not sure it was stripped before or if I stripped it today.

Something like this, but need the size:

https://www.summitracing.com/parts/rnb-55124