Just use the mounts that came with the engine, unbolt them from the block, bring them to any garage (they all have oxy/acet. torches... ask if they could cut them up for you. It's probably going to cost you like $5-10. Keep only the base plate that bolted to the engine and head home.
Once you're there, bolt the base plate back on the engine, then, you'll have to source which isolators you'll use, J.soileau found something good here:
http://www.partsamerica.com/ProductList.aspx?mfrpartnumber=2265[quote name=J. Soileau RB26zcar;...I bought them at Parts America' date=' with the company name on them Pioneer Inc. part# 2265. Also interchanges with # M2265 and 270-2265.
I find them to be 1/4 to 3/8 shorter, which will solve my problem. But the biggest advantage to getting these isolators over the other ones I used, and that most everyone else has, is that these are a wopping**$3.97 ea.** vrs the **$76.00 ea.** I paid for the other set.
Here are the comparrison pics:
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Bolt them to the car.
Then, you'll put the engine on jacks exactly where you want it in the car, height, and front/back & side to side positioning.
After that, take some heavy cardboard an just link the 2 pieces together based on the original design or you can use tubing or H.S.S., like some guys here and AUS. company Castlemain Rodshop.
Once you're done with that, go buy the necessary metal, use your cardboard template to trace on the metal and after that all what's left to do is go to a welding shop and tell them: weld this here and that there...
Will cost you way less than if you had them made.