Good luck getting them from Winstanley
![Undecided :-\](http://www.radbmx.co.uk/forum/Smileys/smilies/undecided.gif)
As for BB sizes, US BB is the most common size for all old skool BMX.
Mid is the size of a lot of New Skool BMX, they are pretty much the old skool sealed bearings without the alloy bearing cups.
& Spanish, I think it just slightly smaller than mid & again just the bearings pressed into the frame.
Hope this helps
![daumenhoch :daumenhoch:](http://www.radbmx.co.uk/forum/Smileys/smilies/daumenhoch.gif)