ALWAYS USE STOCK FLUIDS!!! ANYTHING ELSE WILL LEAVE YOU WONDERING IF IT´S THE FLUID! Suzuki knows that their bottom ends and transmissions are all fed by the same oil. they use additives to keep the oil from breaking down in the gears so that it will last 1.5 times the service interval.
as far as your clear lenses, order any universal pair that has the shape you want. they are everywhere. so long as they fit the rf in question or a gsxr of the same vintage.