If you need to, just flop the back seat down.
I took a batch of tyres to school to dismount and dispose of - here's what I had in my 88 2-door...
4 x 33"
2 X 31"
3 X OEM (225/75R15?)
There was just enough room left for me in the driver's seat, I had to pull out all my road kit and my sub driver, and I got whacked in the back of the head twice on the way in - but they all fit!
It was so much easier taking the nine wheels back than taking the nine tyres in, tho.. Easier to pack, too!