I see them all the time on ebay cheap too. Some helpful info on the 2 different types Gear vendors makes. The early units are named J models and the later units are the stronger P models. Now something about the easy way to identify types. Look at the speedo housing at the back of the gv. If its about 2 inches diameter its the more desirable P model. the J model is around 1 inch. Finally about the adapter for the type of trans you have. You say you have a 6.9 with a C6 so you need the adapter for that C6 trans but. Now matter what gear vendors unit you buy even with the wrong adapter on it. Gear vendors will buy what you have a sell you what you need. They are expensive and they also are listed on ebay under the search... Gear Vendors.