RGR_Dorset, just stumbled on your post. I find myself in exactly this position with the car I'm about to buy. It comes with the puncture repair kit and I want the option for a spare wheel an also the level load option. The dealer has quoted me a higher price of £550 than the usual spare wheel kit so, wondering if this is in fact to fit a level load option as he has been talking about fitting some sort of rails to the side to secure the floor properly. Currently waiting on answer!
Do you have the part numbers for the 5 seater with variable load floor parts that you purchased ? Also any pictures of your install would be massively appreciated !
thanks
Nick