Hi All,
I need to replace the old manky bias bar on my car. Most of the items available online include the steel tube to weld to the pedal, which I dont need as im using my existing pedal box.

It appears all but one supplier (which is too big for my application) does not give the dimensions of the centre spherical bearing to allow be to confirm fitment.

Are they all the same size or do I need to start emailing/phoning around to get sizes?

I think there all the same size but not 100% on that.

I bought another bias bar for my pedal box which came with the steel tube you mention. Spherical bearings were the same size

There is more than one size.

As can be seen from this product which fits "Fits 3/8"x24, 7/16"x20 & 1/2"x20 balance bars."

http://www.demon-tweeks.co.uk/motorsport/pedal-box-assemblies-balance-bars/tilton-balance-bar-remote-adjuster-billet-type

The 3/8 and 7/16 seem to be the common ones.