It may be easier and quicker to just have the square mounting plate cut out of sheet and use any cone. A plasma cutter or a local job shop with a laser cutter would have these cut out in a short order.
I've made a few items like this with my plasma cutter.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 15k miles
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