I just measured mine. My numbers are slightly different than what I see above, I don't know why. My car is prob 95% all original factory.

The roof segments are 8" by 3.25". The side strips have the same overall height (3.25") and edge length (8"). The distance between each segment is 1/2".

Pics attached.

71 Roof Strobe Segment.pngSide CU.jpg