Rick I dont have a brochure, but I have what I think is the correct full page add from september 1970 Mini bike guide (It is partially colored) it is the same as this one that Jeep2003 had already posted in the photos section except from a different month and it does not have the page number/"mini bike guide" on the lower right corner.
I would be happy to make a full page scan and send it to you, Its in pretty decent shape so it should scan out alright. Looks like the bike you are working on is dead center in the add.