I tried the tonneau on my plus 4 for the first time today -- well, the first bit went OK and the "Lift a dot" bits on the front went on and it tensioned down when I latched down the back. I thought "This is no bother" ---then the fun started. Some of the poppers are in the right place, but all those from the rear of the door back are way out of line, and one of the door ones is about 3in out!! no way can they fit.
I'll be going back to the dealer shortly and will see what can be done as I'd hoped just to use the tonneau in France for the Classic Le Mans.
We'll see what transpires!!