I got the same Browning 4-1/4" pulley from Motion Industries for about $22.
There are spacers between the motor and mounting plate. The PTO pulley is tilted back because the engine sits at a slight angle to line up with the transmission. The thrower pulley tilts because of slop in the slider mechanism. My plan for fixing mine is to take it all apart, clean off the 30-year-old grease that's lubricating the area where the gearbox plate slides on the QA frame, and then sandblasting/repainting the parts and then making shorter spacers with a tighter clearance so that the gearbox assembly can't tilt as much. I've had a ton of trouble keeping belts on mine, and I think a lot of the problem is because the thrower pulley is tilting. All of my belts have lasted less than half an hour and wear in strange ways. Before I came down to school, I realized that the pulley was working loose and walking backwards on the thrower gearbox, throwing the belt far out of alignment, and flipping it over. If you get a Browning pulley, add a second setscrew 90 degrees from the one it comes with, and use a jam setscrew and/or a retaining nut on both setscrews to keep them tight.
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