mx5 roadster wishbone tube size/type

[andytho]

Abit new to this and I think this has probably been answered before, but search doesnt seemto work right.
Can anybody help
From the book it says to use cds/cfs seamless tube, but what wall size ?
I can get 1" and 3/4x16g (1.6 wall) but is this strong enough for the wishbones.

Found a few posts some using ERW tube with 2mm wall but not really a definite answer
Cheers
Andy