Thanks everyone for your input. Some good practical solutions which have inspired me to persist with my SD508 which I was using in the factory location (before installing the torqstorm and electric water pump). Cannot reinstall in that location because of the water pump pulley delete.
I cut some 6mm brackets on a water jet and have test fit this afternoon with some 16mm steel tubing as temporary spacers. I didn't go with a swing-arm design (like the universal brackets) because my k-frame gets in the way. It's tight under the cylinder head with the 90 degree hose fittings, and there's only about 15mm of adjustment in the adjustable link so we'll see how it plays out (certainly a SD7B10 would fit better with respect to the hose fittings). At the moment I'm happy with the fit so I'll turn some spacers on a lathe and order some socket head bolts to finish it up. Will post here on the forum again when a belt is on and I've proven to myself it works without the belt slipping, excessive vibration, interference, or whatever else.
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Thanks