my grommet that came off of my stock intake is a little to small for my aem intake,  what size rubber gromment fits?
 
I noticed the same, it's too loose. I also work at a parts store and am too busy to pick up a grommet. So if you don't get your answer today, i'll find out what goes in there.
You have an eco, right. <br> 
http://members.cardomain.com/blackoutfire
 
 
i just put the sensor in the grommet and then put the grommet in the intake piping.  it works just fine <br> 
 
 
Go to Pepboys, get the HELP! grommet 42316
It's a tight fit, but it works just fine!

New Picture comming this summer.
 
 
i just used a little silicone