I measured the length of my frame is about 68mm but where to find the 107mm if my BB's size is like this Shimano UN54 Bottom Bracket 68x107

There isn't one. You need to tell us exactly which frame, and exactly which crank you intend to use with it in order to get the correct answer.

about tree fiddy

There are pretty much 4 common standards for shell width and a wide array of spindle width options.

https://sheldonbrown.com/chainline.html

This explains why there are different spindle lengths and how to measure/determine your chainline. And if you are off by a couple of millimeters, don't sweat it. The Chainline Police will not come get you. That's just a myth.

whats normal?

Needs specs. Complete derailment imminent.

This morning I had Ramen for bfast, because I have a cold.

Thx

Damn, that's a good one. Thanks for sharing

I had steamed rice and lentils with sarachi for breakfast. It sucked

bacon!

The lenght of this frame is also 68mm

you can quickly reset all aspects of a frame (i.e., position, rotation, etc.) if you haven’t created the key yet.