Relacement TPMS
 

I have Dorman 974-009 direct fit sensors. These are a metal stem valve assembly. Comes with mounting hardware.
Can use the air pressure method of calibrating them just like OEM.
Cost is less than GM parts.
Look into direct fit for your wheels if need be.

They are metal , so they are for aluminum wheels.

That is correct.

Should move this thread to the Tires & Wheels section.

The amusing thing is that most parts books think that all HHRs have alloy wheels. The salesweasels at Firestone tried to sell the stem kits to me, they are basically a couple of rubber washers and a new nut. The guys at NAPA won't even consider looking at rubber stems, the book says metal and that's it.

315 MHz is the important part of the sensor description, as long as it can mount on the stem you have. Most metal stems and rubber stems with threads will accept them.

FMG, I moved it on over!