Yesterday I poured my own mount using the 94a urethane mix from McMaster. I have the energy ones at 3 corners still.
It has always been my belief that the firewall insert was not strong enough. It also interfered with the support rod for the shifter, even after I trimmed it with a dremmel.
After removing the tranny, dogbone, and firewall mounts, I decided to only do the firewall. I drilled out as much rubber as I could, then cut it down to a fine shape with a utility knife (needs a keen edge) Then to prepare it for bonding, I sanded it (no primer). I left some material from the edge of the original mount around the steel pin/sleeve to retain it's stock location.
The tranny mount looked stout, and I'm told is unnecessary anyway, with the pita of removing all the material.
I opted out of the dog-bone as well. i know this one is adjustable, and did not check it. This may be why some people report them snapping, so I am concerned to adjust it properly. Any help here I would appreciate.
It was easy to mix, and pour, as I was set up for it, and began to set in just a few minutes. The end product looked substantial, and went back in easily. I was by myself but just a floor jack and a few trips under the car and back did it. Very unlike the es.
I'll see if wheel-hop is reduced later today. This is great if you have time to carve out all the stock units, and wait with the car up on stands/jacks overnight. You could pour a really robust mount, for cheap. There was enough for four definitely.

sounds good to me, let me know how this turns out, I dont't know about the firewall mount not being stout though because I didnt notice all that much of a difference in wheel hop when I put the es rear insert in as opposed to the dog bone mount insert but i did notice a lot more vibration so maybe this way you did it will be a good way without as much vibration plus you can contour it to the shape you want it so it is much easier than shoving the inserts in there.
Sean

I took my car out to test the mount, and it works great. Much better than the inserts. I can launch much higher than before, and let the clutch out faster. It handles launches up to 4.5k w/o any prostest. The pedals, shifter, and wheel communicate the engienes throttle even better. It is louder under throttle with more vibrations. Feedback is nice. Exceeding expectations here.
Handling and steering response is improved as well. Seriously less bottoming, and crisper turning. It feels like the engine is held tightly, in a sling kinda.
The interesting thing is that since the mount doesn't contact the bracket going to the engine, it's so quiet. Nothing even close to the vibration put through by the fat, and ill-conceived es insert. This helps with the install.
If it was worth it Iwould do the other three like this one. They don't help as much as the firewall at all. The es passenger insert one is basically solid anyway, and the dog bone, apparently was stout, and not the source of failure. i still wonder how to adjust it properly. The tranny one isn't worht it in the first place I've heard, but I left the insert anyway. Removing it, and casting a new one would even further reduce noise, but I am sastisfied.
You could cast really robust mounts if you jsut took a bit of time to make forms around the hollowed out sleeves. I thought of injecting this stuff into a mold with a turkey baster, but then I jsut took it easy.

94 a-shore?

94a shore of course. Actually I just pasted the part# Ben98se posted awhile back. btw thanks.

Gotta replace my mounts too. Would using this stuff for all 4 mounts be overkill... Where can i order the stuff from? Thanks