No specs used, just made the bracket to fit the motor and sit flat on firewall. Then tack the bracket roughly in position and gave it a test run. Also I made the bracket so I can adjust the motor back and forth about one inch in either direction. These wiper motors are tiny, which make them nice to use. When I wire a switch to the motor I can adjust the wipers for the park position. Also this motor turns in the opposite direction as the original one, which will make no difference.