even the catalogues from the after market manufactures seem to have the wrong pictures in and some even list boots of two different diameters for the front.

what you can do under these conditions (or where the boot's seal wants to be in an incorrect position on the shaft cos the boots too short) is biuld up the shaft diameter with a few layers of black heat shrink tubing to make the boot a tight fit and if you need to 'engineer a different place' on the shaft for the seal you can build up a few layers of heat shrink each side of where you want the recess then a final top layer will shrink into the gap. the boot will then seal just fine on the top layer as the tubing is not affected by grease