After searching for a while I ordered these today.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Looks like these are an older model that have been replaced by DB522's. Limited my selection to diameter as I did not want to cut into the sidewall. Also ordered some 1 inch spacers as these are a little too deep. Weather permitting I'll get them installed this weekend and give an update.