So long as the pulley lines up, it looks like you just need a longer bolt and a longer spacer, right? The bolt is easy- most hardware stores should have it. As far as the spacer goes, you could get a replacement the right length, add a 2nd that's the right size to fit, or stack washers if you want to do it on the cheap. Once it's tightened down it's not going anywhere- just make sure the pulleys line up and you should be good.
Buckle up- I wanna try something!!