Tuscan V8 rear uprights

[cantus]

Hi
I am rebuilding my Tuscan V8 for the last 13 years now ,and I hope to race it this year on the cicuit !
A weak point of this car are the alu rear uprights !
I want to replace them by stronger bullet proof uprights like the old Grif 200/400 are using on the tracks !!
Who knows who is building them or who can supply me with a drawing how to build them !

thanks
William Waardenburg
The Netherlands