As per title, my 85 SD1 didnt come with the floor panel that goes over the spare wheel. What i need to know, is can i get the two panels from the prefacelift model, and put it straight into my post facelift?

My manual states something about the panel having screws to hold it down, but the one im looking to buy (from a prefacelift) says it clips down into place.

Pre facelift were carpeted individually, and would not match a post '82 car (you could strip the carpet off though).
Post '82 cars were bare boards, with a full length overmat.
All had a type of Zeus clip, but i've never had a problem with them moving.
You may need them when the water level rises, and they start floating around though!