Small Engines (Lawn Mowers, etc.): Identify Engine, briggs stratton, 11hp briggs stratton

Question
I have a craftsman 11 HP 38" Riding Lawn Mower   Model# 917.254232  Can you help me identify the engine so I know what type of replacement starter to purchase?

Thanks
Pete

Answer
Engine, 11hp, briggs & stratton model no. 252707, type no. 0621.

Engine parts list:

http://www.briggsandstratton.com/pdf/illustrated_parts_list/100/MS6929.pdf

693054, 3 5/8 housing length

499521  4 3/8 housing length

http://www.jackssmallengines.com/bsstart.cfm

Does this help?
Eric