The store where I bought my stand said it would fit all Weber Q grills.  My grill is one of the very old ones known as the "Baby" Q.  When I got the stand home I noticed that the picture on the box showed that it wasn't compatible with my grill.  However, that didn't stop me.  My old "Baby" Q locks into place just fine.  So glad I finally spent the money on it.  Thank you Weber!!!!