I know absolutely zero about zerk sizes. I took the old zerk down to Napa and bought a handful that were the correct thread size. Easy solution.
This may help...
Zerk Fittings / Grease Fittings
The only 2 sizes I have ever used are.....
Grease Fittings / Zerk Fittings
AS Grease Fittings 1/4"-28 Taper Thread Fittings
1/8" PTF Grease Fittings 1/4" PTF Grease Fittings
1/2" NPT Grease Fittings Drive Type Grease Fittings
I keep a box each of SAE and Metric assorted zerks from HF on hand at all times, saves running around for only one. NAPA has the kits also. The press fit ones are different problem, haven't found one on my BX or any implement yet.
Ron