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OK, well that orange gasket pictured is for the new style plastic hsg/SS liner water pump, this gasket fits between the plastic impeller hsg and the SS impeller plate. That gasket should not be used in between the upper bushing seal housing and gearcase hsg. The original gasket 303339 is still used and has not been superceded.
All that being said, I am often frustrated by the design of the 303339 gasket that is sandwiched between the upper bushing/seal hsg and gearcase. Why the heck is the OD cut back like that! Doesn’t make any sense, and makes it super hard to seal that area properly. Anyone that wants to reproduce these gaskets properly with the OD of the gasket covering the complete mating flange of the gear housing will get financial support from me and an order for 100 of them!