Part number meanings

[07turbophazer]

what does the first 3 numbers/letters mean on a yamaha part number
Whats is the difference in these part numbers 8fu-17681-00-00&
8gc-17681-00-00 any help would be great

 

[Redbeard]

http://www.ty4stroke.com/threads/the-yamaha-part-number.111006/

http://www.ty4stroke.com/threads/yamaha-part-number-decoder.116042/