Here are the steps to replace the plastic vent:
First thing is to remove the gas hose cover. To do this remove the two screws that hold the plastic gas cap assembly to the gunnel.
Open the gas cap and remove the four screws that hold the cap to the cover
Remove the two screws that hold the cover to the deck.
How you should be able to fully remove the cover and get it out of the way.
Now unscrew the old vent. Once that is done you should be able to pull back the gas and vent hoses away from the gunnel.
Now is a good time to remove the p-trap part of the old vent assembly from the vent hose
The new stainless steel vent is quite a bit bigger than the old vent. You will need to drill out the old hole to about 1 and 3/8 inch. I did this using a cheap unibit I got from Amazon for $10. After cutting deburr the hole.
On the inside I had to cut a little bit of carpet away from the gunnel so the new vent could make a good seal
Now install the vent. I used blue loctite on the backing nut and the removable screen. Not sure if this is needed, but I did not want anything vibrating apart. After the vent is installed in the hull plug it into the hose and tighten the hose clamp.
Put the cover back on and tigten everything up and you're done!