How to identify which Wiper Motor (2 speed or 3 speed) Should be on 75 Duster

Look for witness holes, for place where the tank may have been mounted. The cruise control kinda throws everthings mounting place off. My '72 Dart ( I know that 3 yrs changed a lot under the hood) has the tank on the drivers side in the normal place just above the shock stud. My ign module is mounted just in front of it and the starter relay is in the normal place . Your relay is up on the firewall, ign module is in an odd place ( to me). Wondering if everrhing has been moved around for some reason. Also, has the wiring been tampered with. I am thinking the car should have had electric washers, but they are correct I think that under the dash, that arm that attaches to the motor is different between the 2 and 3 speed. Is the wiring and ballast resister for the 2 speed motor look orginal? Are there any holes in the floor above the dimmer switch for where the foot pump would have been?