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I've had similar thoughts of doing this to my hydravac. I'm tired of removing the hydravac every time I put fertilizer on. I would need some sort of electric actuator on the spreader...
I asked the seller for some info/dimensions. This is what he sent back:
The center hitch is a piece of steel 3 inches wide and 16 inches long. It is welded on the inside of the post closest to the blower housing. It is welded in an angle so the hitch is straight behind the tractor.