Inlet manifold vacuum pipe take off fitting.

[Geoff Kingston]

We have just put a brake servo on a 401 and had an interesting time trying to find a fitting to replace the blanking plug at the front of the head. We had expected it to have a different thread but eventually I found some thread gauges and it turned out to be 7/16 BSW.
Thinking I might have to get Brian to make a suitable fitting I pinched one off the 403 Cylinder Head which is awaiting repair, not sure what was attached to it as the car has no servo and it was not ideal but did the job.
I want to put a servo on my other 401 so are these fittings available commercially and where from, have tried BCL but they have not found any yet. If anyone has any good second hand fittings available including the blanking plug part no FS.105/3D I would be interested
Geoff.