I just bought a compact temporary spare wheel/tire, size T135/70-15. It is from a mid-2000's Ford Taurus and has never been used. It has the correct 108 mm (4.25") 5-bolt circle and hub size is correct (to check bolt circle, two adjacent bolt holes should be 2.5" apart for a 4.25" bolt circle). It fits the rear wheel positions with clearance for the brake system. It might fit the front also, but I did not check as I will never use it on the front. In case of a front flat I will move a rear wheel to the front and put the spare on the rear. Cost from my local 'Pick and Pull' was $18, but it took about an hour of checking out about 100 late-model Fords to find an unused spare. There were many cars with a preferable 16" diameter temp spare but the condition of the rubber was suspect. When mounted on a rear position the car lists slightly due to the smaller diameter of the spare (23" vs 25.9" normal).
For a jack I will carry the jack that came with our 2012 Mini Countryman, which fits the Ford body-seam jack point. One could pick up a Ford jack at the recycle yard easily if you need one. For the lugs I will include with the kit an inexpensive long ratcheting 1/2" drive socket wrench and a 19mm socket.
We will carry this kit on our longer trips into more remote areas of the west. The spare takes relatively little room in the boot and doesn't weigh much. These temporary spares are only rated for 50 mph max speed, and extreme caution should be used when driving with one of these on. The car's electronics will nag you the whole time as the traction/stability control system will probably be disabled. Drive directly to the nearest tire shop to repair or replace the normal tire.
Edited by dr61, 15 June 2013 - 09:37 AM.