Dirko HT red

dirko ht | eBay

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I don't have all the threads in My notes but there was at least 2 different threads that named products. Search Polyurethane or just urethane.

http://www.peachparts.com/shopforum/vintage-mercedHomemade Polyurethane Engine Mount Bushings did a similar fill, but used cheaper black polyurethane roofing caulk
Use Of Flexane Urathene
Cheap engine shock mounts fix
Cheap engine shock mounts fix
Homemade Polyurethane Engine Mounts - bushings

When the owner found out the cost of new shock mounts, they elected to (emergency repair) try Polyurethane Construction Adhesive "Liquid Nails" – No. LN-950.
The whole thread from below
380SL Diesel Conversion Project

Polyurethane filled motor mounts has shore hardness comparison chart
380SL Diesel Conversion Project

I get mine at Reynolds Advanced Materials (Reynolds Advanced Materials | Everything for Mold Making & Casting), but a Google search for polyurethane casting resin will turn up lots of sources. The critical parameter is Shore A 30.

Mold making and casting stuff
Everything for Mold Making & Casting | Reynolds Advanced Materials

W123 urethane or silicone reinforced motor mount?

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84 300D, 82 Volvo 244Gl Diesel

I used some 2 part polyurethane per some of the threads on this forum to refill my engine shock mounts. They are still in good shape. I'm thinking price was ~ $70 which should last me a long time if it continues to stay in good shape when stored. It looks like a lot to spend for what you're trying to do but would fill any size shape that you want.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

not sure if this will be of use to you, but check out this fellow forum member's thread:

Fun, cheap fix for broken plastic clips, tabs, probably lots more

Flexane Urathene comes in 2 parts and you can get it in different Shore Hardnesses. But, as you said it is expensive.

I think one new Engine Shock Mount is around $125-$150 for one.

If you paid $70 for the 2 part Urathene and you made 2 Engine Shock Mounts fro that (mine has 2 of those upper Engine Shock Mounts) you saved quite a bit of Money.

Actually even if you only made one Engine Shock Mount from the Urathene you saved money.

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84 300D, 82 Volvo 244Gl Diesel