Cooling Issue

The thermostat solved one issue. Now I just need to find the right combination of pulleys. The problem I'm encountering is, the smaller diameter w/p pulleys I'm finding on ebay are shorter than the one I've got now. I guess I can go that route, then simply install a spacer behind the crank pulley and alternator mount. A fixed fan would solve it as well.

Anyone know a good source for a single groove pulley set?