Has a briggs and stratton 16hp engine model number: 402707-1240-01. Engine was manufactured in 1994. The sticker with the mower's model number is ripped off.

Hi,
You may try 46904x92A. This is actually a 1996 model, but ought to suffice. The sheet metal may change; belts etc. should be the same. Pretty much all 46" mowers by Murray at that time used a Briggs opposed twin.
If you like that one , you can try the below link. No tractors listed before 1996.
http://www.milacalawn.com/parts.asp
Pick the parts link and you get to the EmPart ARI site for parts lookup. You must go through a dealer, but many have them.
Peace,
Clarke

Looked up some diagrams for that model and it looks the same. Found the drive belt I needed and it fits models from 1994 onward. Thanks for the quick response.