Hi
My S-type R had a space saver and replaced it with a full size alloy
if you have the space, then you should be able to fit, on my car it was a option
you could remove your front wheel and see if it fits in the boot
if your cars like mine with it been a R, the wheels are staggered, rears are much wider than front, I bought a front wheel for the spare, as that will fit front and rear
rear will only fit rear, as its too wide for the front, if your wheels are not staggered, then any will do,
cheers
Joe