[Healeys] Fuel gauge brass nuts BA?

[Bert Van Brande]

Looking for the specification of the brass nuts on the signal posts of the fuel gauge (where the electric wire attaches) for an original 100-4 gauge.  I believe they're BA.  I measure an OD of 0.137" and since I don't have BA/BSF/Whithworth gauges I estimated thread pitch around 38 TPI   

According to Wikipedia this brings it close to a 4BA   0.1417 in / 3.6 mm	38.46 TPI  So I measure 4 thou difference on the diameter.  Maybe wear or my calipers.

Can anybody confirm or correct my thinking?  

UK model engineering supplies still carry these nuts, not sure if there are sources on this side of the pond but postage on a couple nuts will likely not be too high.

Bert