Re: 1996 150 HP HeadGasket
If you want definitive info, get an OEM shop manual. I don't know about the use of any silicone with the O rings.
This is what BRP website shows:
36 0335523 O-RING, Cylinder head. Included in Powerhead Gasket Set
There may be an adhesive used to hold the O rings in place during assembly. Again, consult the OEM shop manual. I don't think there's a conventional head gasket choice here.