YW. I have never seen them, but I have heard folks talk about them a lot regarding the pre-merger cars. I suspect they were either Volvo or BMW applications which either bolted right on, OR reguired very little modification so that it was a simple fit without any engineering or any real effort. Over on STD.com there was tons of chatter about them around a decade ago; however, nothing ever materialized. Something tells me if a set would surface, then their true ID would surface. Then, it would be a rush on the remaining stocks.