I haven't seen those wheels before, must have been added within the last year or two. Only OEM 18s I knew of are the Denali wheels. Look good to me and many of the 18 and some of the 17s look nearly as good as 20s on our trucks.
The wheels are actually Saab 97x wheels with chevy centercaps. I have only seen them on 1 Trailblazer with Michigan plates passing through my town once last year. They were a real pain to find and once I found the wheels I went to 2 dealerships for chevy centercaps and they told me that they were not gm wheels even though they have a gm and a part number stamped in them. I ended up calling a company on ebay that had aftermarket gm wheels for trailblazers and told them what size centercap I needed and they had them. All said and done I had brand new wheels, new tires and centercaps for under $1000.
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