Screw in brake mounts

[ED209]

Need brake mounts for my Pork ... Snav needs them too 

So far I got these ... and the thread is too small.

http://www.ebay.co.uk/itm/BMX-Frame-Removable-Brake-Mount-Kit-Free-UK-Delivery-/261307502327?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item3cd7240ef7

these... the thread is right and the pole of the mount is too slim for U brakes

http://www.ebay.co.uk/itm/Brake-Pivots-for-V-or-Cantilever-type-Brake-Mounts-Bosses-one-Pair-/261388385510?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item3cdbf63ce6

...I tried the ones I had in some Unknown forks and they worked fine ... but I had to sell them with the forks.

The only clue I have is a note on the Hoffman mounts from Alans that says of the Colony ones "Fits most frames with removable brake mounts except American-made ones (S&M, FBM)" so as the Pork is US it must be these ones we need.

I've asked Ron Wilkerson for some but I've been waiting a while ... anyone got any ideas? the thread has to be larger than the mount pole to be right