I made brackets for my side pipes and used (from memory) Cortina gearbox mounts, I have the part numbers at home.
They then bolt directly to a flat plate under my car.
These first 2 pictures show the mounts and brackets, The round section is welded to the side pipe, and the nut you can see is what bolts to the plate under the vehicle.
Not a great picture but you can see the brackets welded onto the pipes.
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.