Hi, I have this outdrive on my 1964 glassmaster 16' with a mercruiser 110 HP engine. There is no identifying tag on the outdrive anywhere. From what I read, stock would be a type 1, 1a, 1b, 1c or type II. I had some one suggest that it might be an R type? Note that there is one hose per trim ram, no reverse lock and a hole in the outdrive port side up high. I am guessing this is for exhaust if the water is backing up?<br /><br /> http://www.imagestation.com/album/?id=2330115093&congratulation_page=Y