Showing the stud in the lower of the two possible positions when attached to the crankcase bracket. Note this is an old mount where the 'eared' or oval back-plate of the mount has been ripped off.

Dimensions for fabricating a spacer.

Looking up imnto the chassis bracket from below. The locating plate is fitted so that the hole is in the lower of the two possible positions, to ensure the mount stud is near the bottom of the chassis bracket slot.

The rubber mount and chassis bracket from above. There must be sufficient spacers to prevent the stud lying in the bottom of the slot, but not so many that the locating plate cannot be fitted the correct way round.