Briggs engines have a code stamped on them that identifies them. This link should help you identify where it is. Then you can use that number to find the drawing for your engine and find out the part number of the carb you need.
If this is a craftsman mower,you can go to the site I posted. put in your information and you can have the part shipped right to your home. I hope this helps. http://sears.com/parts
Answers & Comments
Briggs engines have a code stamped on them that identifies them. This link should help you identify where it is. Then you can use that number to find the drawing for your engine and find out the part number of the carb you need.
http://www.jackssmallengines.com/briggs_and_stratton_model_locator.cfm
If this is a craftsman mower,you can go to the site I posted. put in your information and you can have the part shipped right to your home. I hope this helps.
http://sears.com/parts