The shape of the motor is not symmetrical, therefore there is 2 option, left output joint and right output joint. Make sure you get the correct model before you order.

Specifications:

• Left motor
• Voltage Rating: 12VDC
• Rated Speed: 60 RPM
• Rated Torque: 2.9N.m (30kgf.cm) 
• Rated Current: <15A at 12V
• Stall Torque (Locked): 9.8N.m (100kg.cm)
• Stall Current (Locked): <28A at 12V
• This is motor meant for driving car's window as the name says
• It is being tested to drive car's window:
  • Up and Down for 8 seconds, survive 10,000 times
  • Not meant for continuous driving without stopping