Interesting..., I have just been going through this with my Corvair Station Wagon. The trans/differential has two mounts roughly 2" x 2-1/2" circular. They are $170 for the pair!!! After investigating the Polyurethane method I came to find that it comes in many hardness's and within the hardness factor there are numerous scales that they are measured on.  Shore Hardness A seems to be the appropriate scale.

Shore Hardness A as it applies to factory motor mounts can be anywhere from 40-50. 60 is commonly sold as stiffer upgrade. Then you get these people who go all the way to 94 which is like solid steel. Smooth On is one of the big suppliers of the Poly and they have a chart that helps you understand. https://www.smooth-on.com/page/durometer-shore-hardness-scale/

Because most motor mounts are primarily compressible (downward, at an angle) the 2 part Poly should do well. In the case of my Corvair they are vertical and housed in a 2" tube with a center bolt. Because adhesion was paramount I opted for another product. The regular Poly can shrink and I would lose bond in the tube. Thus I opted to use 3M Windo-Weld 08609. This had adhesion properties to strongly bind a windshield to the car but is still a Poly product with a Shore A hardness of 55-60. The only down side is that it is a 1 part moisture cured product. I had to put it in in 1/8" thick layers (that would we 12 layers) two hours apart and it was a 24 hour all night affair. While cheaper than buying new mounts the stuff isn't as inexpensive as many state. They are often sold in "Starter Kits" otherwise you are buying gallons. Tax and shipping pushes the kits into the $40 range. My Window-Weld was 10.5 Oz. and was $33 with tax (free Amazon shipping). I used two thirds of the tube on my two mounts.

Anyway, sorry I don't have any 2.0 mounts for you to test with but hopefully the Poly information is helpful. I've included a before/after picture of my Corvair mounts as inspiration.




 

Thanks for the info...

I found the Smooth On and spoke to a rep and that was one of the resins i was considering..

He mentioned.cons iderations about heat so i measured the temps of the mounts after driving about half an hour in 90 degree weather i measured 145 degrees on driver side and about 200-210 passenger side under the exhaust manifold.

After some research, i found these options for universal motor mounts

https://www.autozone.com/external-engine/motor-mount/p/duralast-engine-mount-2123/154237_0_0?vehicleId=1409201

https://www.autozone.com/external-engine/motor-mount/p/duralast-motor-mount-2429/108977_0_0?vehicleId=1409201

And i think i might try adapting one of these since they are rubber and one has mounting stud
 molded in. And i thought about drilling the studded one and adding a "safety" bolt to replace the canle in the factory mount to limit stretching on the driver side which is under torsion load.

The other might be good for soms sort of bolt thru sandwich arrangement.

Rock Auto seems to be "Out of Stock" on all the mounts though they list five different types. From what I can see they are a standard round mount with the exception of the safety wire and the half surround on the metal base. You MIGHT be able to find an industrial intended mount of similar size and fit it into a gutted stock mount.

Regarding the polyurethane most I saw stated around a 150-180 degrees limit. On my Corvair being air cooled vast quantities of air are constantly being drawn into the engine compartment so for me it was less concern.

Still seems feasible to me. If you wanted to retain the metal part of the original mount you could notch the rubber with an angle grinder and a coarse disc.

It looks like it will do the job. The alignment pin might have only been there to assist for assembly to keep it from falling off. As in, one person places it on the bracket and another person tightens it. Or it might be there for anti rotation when it is being tightened.

BTW, I don't remember bolts on the metal engine mount. My recollection was that I had to cut mine out because they were welded. and when I went to the 2.3 I had to get 74-up brackets and weld them in too.