I couldnt find anything that looked like pic #7
kind of looks like it may have came from a grading /leveling attachment.
I do have manuals for the rest of the attachment pictured though
I don't have anything in my manuals/literature either.
It's possible that it was homemade, but I can't say that with certainty. .....It may be a tool adapted from another brand of tractor.
.....If it was not painted green or gold originally, it was probably NOT made by Bolens. .....I don't know if Brinly ever made attachments for the Ridemasters.
My best guess is that it is a "ripper" or "scarifier" which would be useful to loosen hard-packed soil. ......Without seeing better pics, there may be holes for adding cultivating tools to each tine. ..........There does not seem to be any adjustment for spacing of tines, as most cultivators would have.