V6 Engine Mounts- Driver Side?

I seem to remember that there was a driver and passenger side engine mount. I forgot to make a note when I removed them.

Which is which?
How do you know?

 

Hey Scott,
Can you just line them up with the frame holes & Measure back to a common point.?

 

I thought this was unusual when I replaced my motor mounts. Both sides look identical. The new mounts have the failsafe clip.
The one on the left is for the drivers side. From my build thread:

Gem Of The Rockies ‘71 Rii Restomod | ECJ5 (earlycj5.com)

 

They used to say left and right on the tab.

 

So I started on the driver side and one did fit better so I went with it.