G, Looks lie the QQ came from a boat that had the 3'' taller riser,do they seen to be 3'' taller then the center of the riser? i would just get a 1/8'' cutoff wheel for your 4 1/2'' grinder from home depot and trim them to fit..I have run into similar problems in the past on thease things and had to trim them so they fit..
if you have a stock manifold and riser i bet they will fit but it wont line up with the tip,,the stock riser is taller and the pipes you have on the gill's, you have a manifold hugger style riser..you will have to trom them so they fit properly with what you have..its ok for the end of the riser to fit into the inside of the QQ and you may have to trim the riser end also to do so everything lines up properly..
Install the tips last