Wanted: Britax harnesses

[Kisjes]

I was hoping any of you readers of this forum is able to help me with the following. I am looking for two Britax 4 point harnesses, type clubsport in the light blue / grey color. These were packaged in the yellow black karton with Sir Jackie Stewart printed on it, a real early 70's article. Must be a complete set, secondhand is fine as long as they are in a good condition. As I couldn't find a good picture of these harnesses I hope you know which type I mean.

Thanks in forward,

Michiel Kisjes.