Sbp junkyard space saver spare ?

The 5 on 100mm are close, but NOT exactly right. You can probably get away with one as a spare, IF you plan on putting the right wheel back on as soon as possible.
This is assuming you are using steel wheels, if you are using shank style mag lugs, all bets are off.
Edit. Go to SizeMyWheels.com .They list 179 cars that have 5x100mm wheels.