Being a 2006 you ought to have what is known as a Turn Key Start Carburetor which is designed by Mercruiser and without searching to see if things have changed "recently" I don't believe you'll find another new one (Carb) from a different manufacturer or brand name like Sierra Marine, etc....In looking further there are certain Sierra parts kits like 18-7098-1 - Carburetor Kit, 3302-804844 Plus a Mallory 9-37612 kit that matches the Sierra #...Also number such as 18-7202 - Float 1397-5837, 18-7859 - Filter, 3302-9033, 18-2552-9 - Gasket 27-33179 2-Pack, 18-4264 - Pipe Plug, 3/8-18 NPT.
I also see numbers next to the Merc carb part numbers that area misrepresented that have the carb part number then goes on to show parts kits numbers as mentioned here for the 3.0((18-7098-1 - CARB KIT - Replaces Mercrusier #3302-804844002.
One thing you could try doing is inputting your engine serial number at the top right of the following link to help locate your engine parts, find the carb part numbers and then search the numbers online for best deal, etc...,
https://www.mercruiserparts.com/
With all the headaches I tried to mentioned above :faint2:, another lower cost way of getting into another carb that fits is find a remanufactured carb such as this for example,
https://flyingfishcarburetors.com/Y38-84Mercruiser.htm
Good luck.
