Another thing to remember is that what's on a race car (especially a professional race car) may have nothing to do with the sponsor logos or what the teams says is on the car. I crewed on a professional ALMS race teams who had their Hypercoil springs powder coated purple because they were sponsored by Eibach. The BMW professional team in the next pits had their Penske shock cans and other shock parts powder coated orange to look like Motons.
EDIT: And the above situation usually occurs innocently. If you're a race team that has no shock sponsor and you're good enough to start winning, you'll be approached by a shock company to run their products. Well, that's all well and good and extra money/parts are nice, but you already have a winning setup and its mid-season and you have no more time or money to test and develop a completely different set of shocks. So, its easier to make what's working for you look like you're new shock sponsor.
EDIT2: And what's on a professional, top level race team is most likely not anything you or I can buy. Yes, we might be able to buy the model Tein shock that was on those old rally cars, but we certainly can't buy the custom valving inside that was developed by the race team in conjunction with the Tein engineers. I worked with Penske and EMI racing for two years to develop a set of Penske 8760 shocks for my 240Z and the only way to duplicate that is through me.