As there is very little space in the boot of my B, I'd like to replace the full size spare with a doughnut (compact spare wheel and tire). I've heard that certain 80's and before Saab spares will fit the 4 1/2 inch 4 bolt pattern. Are there any other small temporary spares that also fit? It seems that finding an old Saab spare would be quite difficult. Thanks, Barry - early 74 B