3.5 outboard lower unit - water intake?

[gallobg]

I recently purchased a used, lower unit assy for a 3.5 outboard. My old lower unit had a water intake pipe to feed cooling water to the piston head. The "new" lower unit does not have a water intake pipe, or any structure to accommodate one (e.g., no interior mold recess, no guide holes out of the exhaust rear, etc.).

See this link for a comparison picture:

http://oak.cats.ohiou.edu/~bg101597/KB_lowerunits.jpg

Is this a special lower unit made for an air cooled powerhead? Can it be rigged to take a water pickup tube? Other options?

[MECOA]

You bought something someone butchered up. Probably junk. Sorry.