Resurrecting this old thread for an update.
While driving the other day I hit the throttle and had a problem. T-case lever shot over and back, but too far. Bad vibes too. Got home and discovered a few things. One, the pass side mount had apparently failed at some point, perhaps because it had been taking up all of the vibration-reducing capacity for two mounts, and two the driver's side had been slowly vibrating itself apart as a result of the failure. It came apart, and the engine was just laying there. Pretty much dead in the water.
I called Steven at Rugged Rocks and he sent me two of his new mounts that he's making for the first gens. I must say, the RR mounts are a better design than the replacement I originally used. I had had a problem during assembly when I first made this post in that things didn't really line up perfectly; the top angle was off. I made it work by tightening the top first then getting the rest down after. Despite using double nuts and lockwashers, everything still came loose. I thought the angle problem was because I had only installed one and the two weren't in line, but I now know that wasn't the case.
The new RR mounts have an offset base that makes things line up correctly, you can see the difference in the pic. To confirm this, I put in the driver's side first with the old busted mount still on the pass side. It lined up and installed just fine. Put in the second one and now everything is back to normal. Also, the RR mounts use more appropriate bolts that make them easier to install than the other one I had put in.
All in all, these are a good addition. The RR mounts are priced much better than the other one as well.

Finally, a better & stronger motor mount

Finally, a better & stronger motor mount