This image shows how the brackets mount to the inner side of the geared end of the power window unit. It also shows one of the spacers mounted beside the bracket. The brackets contain a notched end which slides over a mounting point on the geared end, then two screws are used to support it through supplied holes. Use of a good screwdriver is necessary, I found it very hard to screw the screws in, swapped screwdrivers to a better quality (and different profile) screwdriver and they went in without a problem.