1978 Sears GT 18 6-speed: need size of belt for belly mower

I recently inherited my father-in-law's 1978 Sears GT 18 6-speed Lawn Tractor with 48" belly mower (Sears part # 917.253551). I've got it running but I need the belt that runs from the engine across the idler to the center mandrel on the mower deck. Can anyone tell me the size (length and width of this belt)?
 
5/8 x 103" I use Gates BX100, it lasts 3x longer than B100. It should still be cheaper than the 6941R belt from Sears at $33+.

When you shut down the mower, be sure to idle or stop the engine first because the belt could start whipping and tear.
 

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