Where can i buy a rollbar for my haynes chassis?

[fha772]

As the title says, who supplys roll bars, for the Haynes roadster?

Either built or flat-pack.

Complete with harness mounts.

It's just that my tube bender is very heavy duty, and will just crush the tube required for the roll bar.
To use my bender, I'd have to make it out of 4+mm wall tube!!

How much can i expect to pay?

Cheers Frank.