Topeak Quickclick Rear Rail Mount

I have some saddle/seatpost combinations that don't work with the Stock QuickClick mount. I created these to mount on the rear part of the rail. fit can be a little tricky, as most saddles have different angles and distance on the part of the rail, I have a few different sizes.

65mm fits appears to be middle of the road
60mm fit my Sella Italia Filte Crabon (6x8 rail and narrow up the back.)
70mm is pretty wide, doesn't fit anything I own..

The stock nut and bolt(M5x25) will work, a M5X