I see. Well you'll use a simple 3/4 shaft size for the drive pulley. The rear came in two flavors: either a 6" or a 7". Which one you need depends on what was on there. Actually, you can use either one. The belt size will be dictated by which driven pulley size you go with. The sprocket I can't say for sure without seeing it but more than likely it is a standard 40/41 pitch.
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