My front motor mount is out and is bad. Has anyone used anything to fill them if so what did you guys use?

I used 3m window weld to fill a Saturn Torque Axis Mount (TAM). It reduced engine movement along the torque axis significantly and it also made my interior rattle much worse.

The price for legit window weld and the motor mount insert is about the same..Might as well buy a full prothane kit and call it a day and yes the car will vibrate a lot more than normal and so I hope you don't have bad hood hinges..The vibration from that will send you nuts..