Griffith seats - any bracket under the body?

[SwedishTVR]

Hi, I purchased my Griffith partly disassembled and am rebuilding it. I am about to mount the seats and like to know if they only are bolted to the fiberglass floor or is there is a supporting bracket used under the body, giving additional strength?

The underbody seens to allow for a bracket, but I have not seen such brackets….

Anyone here who knows?

[SwedishTVR]

I am considering to add two strips of metal that clamp around the chassis-tube close to the front seat bolt holes.

I am in Trollhättan.