Bravo I Upper-lower Compatibility
#5
The link below will help give you an idea of what to look for with this question.
http://www.boatfix.com/merc/Bullet/91/91_20.pdf
http://www.boatfix.com/merc/Bullet/91/91_20.pdf
#6
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If you have an old style upper with no oil passage you can put a newer lower with the oil hole on. The newer lower has to have the oil passage closed off so no water gets into it. Tap it and screw plug in or 4200 or silicone, anything to seal water out.