The chassis fixings are captive
Well yes and no. They are formed of two studs welded to a plate and fitted from the inside of chassis, through holes drilled just behind rear cross member. If side pipes are spec'd on the 3.7 Roadster at least, the holes are drilled forward of rear chassis member to accommodate the shorter silencers. Unfortunately once all the trim, seats and belt fixings are in it's too onerous a task to move them I found.
