Big Engine mounting plate?

#1
Im Trying to keep from fabbing up a engine plate for this big Wisconsin side shaft I have. I have the mounting plates from Azusa but they are for the smaller engines like the 6.5 clones I have and the 6.5 Tecumseh. They cannot be machined for the bigger engine, they are just too small.

Anyone know where I can get a bigger mounting plate?
 
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