I don't know what you want to know? To my knowledge, NONE of the Quietline tractors came out with holes in the frame for the 450 blower. The 450 didn't even come out until MTD took over if I'm not mistaken. The only 2 stage blower IH offered was the 350, and it came out late later in the 82 series. They did offer an adapter package for it to attach to the QL machines. But the 450 was never designed to go on the QL's. So.... the holes have to be added. If you already have a machine that has holes drilled, what difference would changing to another machine make?
If you are running a 450 blower on a QL and using bolts in it at all, you have it mounted "correctly".
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