I had the same question. There are 3 belts and I know the answer to one of them; 5/8" x 52" Stens 258-052 $23.00 at Ace. This is the main drive belt from engine to the center where you put it in gear. Also the hardest of the three to replace. I hope this helps someone.
Check out lawnmowerstuff.com , I found a belt for my Ranch King at that site.
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What size belt do I need for my Ranch King by MTD 12/38 7 speed?
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