These plastic mounting brackets are specifically designed to work with our mini plastic gearmotors. Both the offset and 90-degree configurations of the mini plastic gearmotors are compatible with these brackets. The brackets are sold in pairs, and four M3×12mm screws and M3 nuts are included (two for each bracket). In some orientations, the mini plastic gearmotors have a lip that causes the bracket to be raised off of the mounting surface; for those cases, two 1.25mm-thick spacer plates (one for each bracket) are also included. You can see the spacer being used in the rightmost picture below.
We also offer a tall version of this bracket that allows for alternate mounting options that might be more appropriate for particular applications.