I agree on the "knockoff" comment Jay. I learned the hard way this summer. I bought some "new" fuel injectors for our boat that were 20% the cost of Mercruiser's price from eBay. They worked but burned 15% more fuel than the other OEM engine. At $5/gallon on the water, burning 20/gal/hr, that adds up fast. I did find that the OEM for Merc was Magnetti Marelli and they made them for Merc. This did save some $$ but they work perfectly.