On my 70" triplex if you are standing behind it it is a brass tag mounted right above the left side drive wheel on the sheetmetal cover.
Found it! Lift up seat and you'll see it there!
Find your model number and look for wiring diagram at sonnysbolens.com
model type and code of the mower and from the engine. generally it is metal stamped on the engine and the unit model is near the rear of the mower.
You will need the model number off of the mower. It is usually under the seat. Go to www.managemyhome.com and enter your model number in the appropriate box on the right side of page. You can view and download manuals that are available.
Murray typically puts their tags on the very rear of the mowers in the center below the seat.
No you can't use a golf cart mower on a lawn mower. You have to find a muffler that matches the make and model of the lawn mower.
It's coded in the model #.
on the mower deck
Go to managemylife.com.
Don't know that you can find a manual online except for purchasing it from Sears. Here is a link to the Sears parts website. Enter you model number in the field provided and click search. You will find the part numbers for every part of your lawn mower - including the part number for the manual you want. http://www.searspartsdirect.com/partsdirect/index.action
it is under the seat,if you can still read it
Try Here: http://www.managemyhome.com/mmh/lis_pdf/OWNM/L0806846.pdf