"Harold" in The Good Guys and the Bad Guys

IMDB has a list for roles for an actor named Stuart Lee.

https://www.imdb.com/name/nm0498293/?ref_=ttfc_fc_cl_t21

It says that Stuart Lee has an uncredited role as someone named Harold in this movie.

It also lists him as playing "neighbor boy" in the Red Skelton show in 1970, "boy" in Nanny and the Professor in 1970, and Dr, Michael William "Mike" Horton in Days of our Lives in 1973. That seems like a rather inconsistent age range and it is possible that IMDB mixes up two separate actors.

So does anyone remember the character of Harold in The Good Guys and the Bad Guys and can say whether he is an adult or a child character?