I just spent 4 hours replacing the ones in my 67 cuda because the drivers side one was broken...

HAD A HELL OF A TIME getting the lower bolt out as it would just spin the mount (they are factory style locknuts) - I used locktite and regular nuts when I put them back in...

If it was not for this it would not have been a big deal...

I used the polylock ones; starting the car up and taking it to work tomorrow... - I also replaced the trans mount.

The best option for a-body owners is to use the spool mounts...