hey, in the states a doughnut is the small sized spare in the trunk. But in searching for parts for my car i found an exhaust gasket or exhaust hanger (can't remember which one it was) that had the name of a doughnut also. dunno if this helps at all, does it sound like there's an exhaust leak?
Isuspect that the doughnut referred to will be a rubber doughnut that mounts between the wishbone and the chassis to isolate the car body from the shocks imparted to the wheels by the road. Nearly all cars have suspension that is mounted this way so they don't crash through holes in the road.
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