What are the exact dimensions of a B-2 Spirit?
I doubt you will find an official source for these. Luckily, we have google maps.

Using this example from Whiteman AFB (https://www.google.com/maps/@38.7250446,-93.5602627,145m/data=!3m1!1e3?hl=en) and distance measuring tool we get the following lengths:



1 - ~4.65 m (~15.24 ft)

2 - ~3.69 m (~12.10 ft)

3 - ~7.83 m (~25.69 ft)

4 - ~10.71 m (~35.13 ft)

5 - ~4.58 m (~15.04 ft)

6 - ~31.52 m (~103.40 ft)

The rest you can get from the published dimensions (height, length, wingspan), as an example.