I understand a head support is needed. Could anyone help with ideas or picture of how they have made them. Can you use U bolts onto the roll cage?

Check out pictures from Strikers. They use a lot of headrests that are bolted to the rollbar.

[Edited on 28/2/08 by Aico]

The rules say you must have a headrest of a minimum of 100cm^2 area as the first point of contact with the rollcage behind your helmet.

U-bolts should be ok to hold something on and are preferable to actually drilling into the cage itself. I don't know how true it actually is but one of the 750MC scrutes told me that invalidates the certification of the cage.