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I have a Scag stz-20kh serial 1937 with a smz52 serial 1917 deck. I want to replace all the belts on the machine. They are worn and unreadable and streched to the limit. When i search for replacement belts i either get obsolite part numbers or one website will list the belt legnth different from another. I can get my belts wholesale but i need the width and legnth(outside). Can anyone share this information or where i can get accurate numbers?

Partstree.com can help you. You need model # and SN

I shop here for all my Scag needs.

Partstree is good for using IPLs to look your numbers up, but their prices are inflated over dealer retail.

I only use them to look up part numbers and the size of a belt.

If this is you deck Lawn Mower Parts, Small Engine Parts & Much More! | PartsTree.com - Briggs, MTD, Toro, Cub Cadet, Husqvarna, Troy-bilt...
Then this is your part numbers and size.
Scag 48285, 5/8-inch x 56-inch
Scag 481001, 5/8-inch X 128-inch

Yes, the correct belts are "pricey"!!!

Thanks for the help and just a quick fyi vbeltsupply has been the most economical place ive found to purchase belts and there is almost always a cupon code avaliable i have used them for many purposes at my sawmill with great success thanks again