Here is a PDF catalog of the Morel units with the binding posts visible on the 1st page.
http://www.morelhifi.com/media/pdf/Soundspot.pdf
The knobs are 1cm in diameter and protrude 1.5cm out from the enclosure. I'll send you a better shot I've taken. Brass finish is sought, but basically, the problem is finding any binding posts at all that are smaller, more compact, regardless of finish. Thank you.