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Message: <blockquote data-quote="archive10" data-source="post: 912426">the distance from the centra of each hole is 610 mm.they are arranged in a aquare.the holes are 12,5 mm wide (diameter).there are two type of mounts, just as you say.the most common by far is the RxO, which is the three steel tube arms that affix to the dish rim at each side, and one at the bottomthe Tx version is much heavier, based, as you say on a "back plate", which extends to the bottom of the dish, and the feedarm holder is affixed to that.Unfortunately I only have the Rx version of the mount, so I can't tell you the width of that back plate.</blockquote>