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There are two belts one is blade belt and other is motion drive belt.-------
Blade belt is 1/2 X 77-11/16"( inches) ----- And (1973.26 millimeters).-----
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Motion belt is 1/2 X 95"( inches) ------And (2413 millimeters).----
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There is a very informative guide for belt model number and belt sizes used on all mowers.----
This is the direct link,, you directly search in " M" then go to" murray".
see ------
37X61 A-37X61 1/2 X 95" (2413) Motion Drive belt, for 46" .
And
37X70 A-37X70 1/2 X 77-11/16" (1973.26) Blade belt, 46"
