1997 Mercury 115 outboard lower unit needed

[GifTed]

My brother in law has a 97 Merc 115 outboard. He is in need of a lower unit. He gave me a serial # of 06466438. How do I know if it is a long or short shaft? What should I be looking for? It is a 115 ELPTO. When I have looked up the serial# I get info like its a 7.5/9 hp. How can that be? Can someone point me in the right direction? Just trying to help my bro out. What better place then a Merc Forums. Thank you.

[boats.net]

Recheck serial number, it's probably starts with 0G instead of 06.
A ELPTO model would be a 20 inch transom.