Drive belt help Murray 13AN772S058

Drive belt was already off and gone when I got the mower. Needing advice on part number of drive belt. Diagram of routing and any help on how to install it. Thanks in advance! Dan

That is NOT a Murray number .... it's MTD

This manual should be what you need to install the belt , ....

http://service.mtdproducts.com/Training_Education/770-10579.pdf

you can get the belt P/N, by visiting the MTD website and using your model # to get your Operators Manual ,
the belt Numbers are in there .