1970s Marbles Winners on The Mike Douglas Show?

[ElizPagelHogan]

Hi, I'm researching the U.S. teens (mostly from Pittsburgh, PA) who traveled to the U.K. in 1974, 1975, and 1976 to plan the British teams. I know at one point, the U.S. teens were on The Mike Douglas Show, either in 1974 or 1975.

But I can't find any reference to the date of the episode. If you remember this, and can recall any detail, for instance who the co-host or musical guest or any other detail, that would help me narrow it down using the episode list. 

I've found online lists of who was on the episodes and read through so many descriptions, but none of them mention the marbles players. Thank you in advance!