Extended Front Porch for Tony Kart

Tall driver here 6’2", would like to try a extended front porch on a 2015 Tonykart Racer 401 30mm.

It seems 2 options are available now adays
CRG extended porch
Birel extended porch

Does anyone know which one works the best with OTK?

I have been told CRG one is pretty universal for OTK. You may have a little play where the straight tubes of the porch slide over the tapered tubes of the OTK front posts, but can tighten that with some rubber o-rings between them. If you have the means, you can 3D print some adapters.