18 hp johnson Question

[bpul2113]

I am looking at buying a 18 hp Johnson from a fellow about 150 miles away, he has pics of it but you can't really tell anything. I need a long shaft engine. I have a model number and serial number. Any way to tell what year, or if its a long shaft or not.

Model #FD15F
SN# 2216514

[boats.net]

It's a 1961 model but don't know shaft length.

[Daviet]

Can you tell from the pictures if there is a 5" extension in the lower unit between the water pump and the exhaust housing?