Hmmm depends on your sizes, I found with the factory standard size tires/rim the wheels won't fit in that position in my car by nearly two inches, so I would have to either cut into the floor and put a divot in like the classic's, or move the back seat a bit.
I have seen a p38 with the wheel in that spot, I am not sure if trim was removed or modified or if the tire was just deflated.

