The PTO on a 1450 is not for a 5/8" belt, so.....
Change the pulley on the blower to a 1/2" pulley. No big deal.
Change the center pulley on the deck to a 1/2" pulley that fits the 44A". They are still available new. Then, use the mule drive for the 44A. Move the lift pin on the front of the deck to the wider spot. Easy peezy.
The "extra" attachment is a homemade cobble job that appears to be for mounting a front blade. Scrap it.
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