Don't know if these are the same as an '09 but they are whats on our '06 Burb.
I got the set of new ones in '09 when we bought the Burb. I was going to install them on the trailer, but after testing, the range was too short so I never installed them.
I remember their being a few different part numbers, but have no idea what the difference would be.
The ones on the Burb are OEM, and still in good shape and transmitting fine.
No apparent corrosion, and had no issues when installing the new tires last month.
"Sticks & stones can break your bones...and hail will dent your Airstream"
So when is this..."old enough to know better" supposed to kick in?