Buster? There were/are two of them.
https://www.roadandtrack.com/car-culture/classic-cars/videos/a24439/this-mercedes-benz-was-part-of-porsches-intimidation-factor/
The latest video from eGarage is not about some exotic sports car or race car, either. It's about the 1968 Mercedes-Benz that Porsche used to carry a generation's worth of iconic competition cars.
"Buster," as it's nicknamed, is one of a pair. It belongs to the Brumos Collection. The only other example is owned by Porsche.