Introduced in the 1970's This is the standard lower leg which exhausts through the lower leg. Used since almost the beginning. This will replace any lower leg which has a screw in prop shaft housing. This will fit early production version with the small skeg and screw in prop shaft housing. Very first production run had a prop shaft housing that clamped between the halves. If you have one of these you can upgrade by using this and a new prop shaft assembly.