Does anyone know what length wheel bolts are needed to fit a steel wheel? I believe they are shorter than the ones used for alloys.

Since I've had no replies to my original question perhaps I could put it another way. Does anyone have alloys fitted with a steel wheel for a spare? If so do you have a shorter set of bolts to use when fitting the spare

dont have a gp but often with a steel spare on a car fitted with alloys, the spare has spacers fitted to the wheel(like welded washers) to cover the bolt length