So instead of shopping on the intarwebz for binding post of unknown origins that could significantly impede sonic performance, I decided to rely on Planabox for the ones he carries (only quality parts BTW). Here is the suggested binding post. At first, it was believed that they would fit but actually after close inspection, they don't as the outer diameter is 13.7 mm. In this case, there would be interference IF using the supplied PCB back plates (which have a center to center distance of 13.0 mm). So, as stubborn as I am, I will not leave things like that. The suggested solution would be to machine a single custom back plate that would cover all the back of the actual 3 bindings spring clips. You can see the delimited area in yellow. I am confident that according to the work done on the AC/IEC plug, this would look totally professionnal. Again, I don't want this modification done if it's going to look ugly. By using a single back plate, that would extend the area a bit, actually large enough, to accomodate a secure center to center distance for the use of the banana binding posts shown. I am actually set on this one.
Edit:
One thing I forgot to mention about why the size of the diameter of the binding posts matters is that I am limited by the screws center to center distance of the original back plates. In order to use binding posts with bigger diameters, I will have no choice but to enlarge the center to center distance of the screws (which now is 60.0 mm). The backplate option would correct this altogheter.
