Hi there SNKBTE.
I went through engine mount hassles afew months ago, check out this thread
Engine mounts
I am pretty sure I have atleast 1 spare L/H aluminium ear laying around that your welcome to have.
Then all you need to do is purchase the R/H ear and 2 mounts.
If you like I can price these for you, I get cost price plus 10% since I work at a Holden dealer.
Just let me know.
No part of my mounts looked anything like what you are showing in your pic
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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.