Prusa MK3 trapezoidal nuts?

I just wanted to see if anyone would be kind enough to specify the bolt hole spacing on the original MK3 nuts?I am under the impression they are not the same as all of the knock off brass nuts floating around online.I can't seem to find any online suppliers for those nuts specifically they tend to list all the MK series together.I am trying to use a few thingiverse files for the MK3 on a custom built P3Steel that I have with no luck.The only thing that has me tied up is a set of these nuts.

measured 19mm, checked with scad which also says 19mm

from x-end.scad

// Screw holes for TR nut
    %translate(v=[0,-17, 0]) rotate([0, 0, -135]) translate([0, 9.5, -4]) cylinder(h = 19, r = 1.65, $fn=50);
    %translate(v=[0,-17, 0]) rotate([0, 0, -135]) translate([0, -9.5, -4]) cylinder(h = 19, r = 1.65, $fn=50);

ie -9.5 to 9.5 19mm.

Thanks for the quick reply Dust