I used the "OBX" brand (I think that's who makes them) from e-bay. They were less than $200 bucks, stainless steel, and have 1/2" thick flanges. Been on for 3000 miles now. Of course, this is on my 57 and you do need the mini starter.

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1957 Dodge truck, Snakeskin Green with a little stroker motor. 1964 Plymouth Savoy wagon ( my new project)