Small Engines (Lawn Mowers, etc.): carb kits, craftsman model, self propelled mower

Question
I was working with John but he's unavailable. Just need to know where I can find a carb kit to replace a few seals. Specifically the needle seat valve.
Craftsman model 917377582  6.75hp self propelled mower
sears engine #143996704  Anyplace you can start me with would be  a great help. I can't find one on the Sears site.

Thank you in advance

Answer
Carb part number 640020A.
Float bowl kit part number 632675A
Needle and seat part number 632709

The float bowl kit comes with the needle and seat.  You can order online or try you local Tecumseh dealer.
Sears listed all the parts.
Let me know if this helps.
Eric