hey, it's a spare.... head out to a local u-pull-it and look for any stock steelie with a 5x4.5 bolt pattern. All it REALLY needs to do is hold air, bolt on, and get you somewhere you can get your real tire fixed.
I have a "compact spare" (i.e. doughnut) from a Crown Vic in my 96 2wd Ranger. Cost $25 at the local full-serve JY. Yes, it does bolt on front and back, and it does hold air. That's all I need it to do...