Andre
The first two that come to mind are Yale and CM. I know that Yale is an old American name. CM seems to be good stuff but I am not sure where its made.....but then again I would not bank on the fact that Yale is still made in the good ole USofA.
My preference is Yale
Tony,
I cannot take credit for making the couplings in the pic....they came to us from the gear manufacturer with a pilot bore. We finish machined the tapered bore and cut the keyway to match the propeller shaft.....but like you said, they do look good