Strap Spring Bar Measurement

There's no spring bar on the watch, but rather a solid pin holding the strap in place (two pins actually, one on each side, of course). It is 29 mm long and has a diameter of 1.5 mm.

The measurments between the two "taps" (I've actually no idea what to call them) on the watch where the strap attaches are as follows (see the disassembly video to see what I mean):
Outer edges - 23 mm
Inner edges - 12.7 mm

Edit: If you want to use a standard strap and have access to a 3D-printer you might want to try something like this: https://www.thingiverse.com/thing:4010651