Not sure if this helps, but mine is fixed to the leading edge of the inside of the rear wheel-arches and through to the chassis side-members.

The tonneau is adapted to fit around the roll bar; the headrests are fixed to the roll bar; the hardtop & soft top fir over the top easily:

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ArthurSBell
N44MOG Rolls Royce Green +4
M22ASB Grey Renault Megane Cabriolet
M10SAB White Fiat 500