Pololu Stamped Aluminum L-Bracket Pair for 37D mm Metal Gearmotors
These aluminum gearmotor brackets let you mount Pololu’s 37D mm metal gearmotors to your project. The brackets are sold in pairs, and each bracket includes six M3 screws for securing the motor to the bracket. Each bracket also features fourteen mounting holes for M3 or #4-size screws (not included), giving you a variety of mounting options.
More specs are here.