Scot, I will take a look when I get a moment. If you just want random seats in the back, then most of the early 240 seats should also fit. For a number of my cars I have fitted 240 seats in the rear so that the original seats could stay protected inside while the 240 seat cops the elements. Everyone is worried about paint…but original interior is harder.
I'm not certain about a boot mat. I used to double them up, but again I need to check if any of the cars still have spares. I did have a set of 68 door cards in as new condition, but I will have to check if they are about. I may still have a NOS grill for the car that I saw the other day. I'm doing a bit of a clean out.