[FlatheadTed]

Since most rear spare brackets have the studs placed in a triangle the drain concept wouldn't work ,going by post 23 it shows the drain of to the side instead of in the middle of the studs so there would always be a residue of water in there, maybe since the rear spare has the cap facing up its less likely to get water in it anyway .Maybe its meant for side mounts only ,as said there's a left and a right bracket that should place the wheel drain at the bottom providing you have the correct bracket ,