Hi,
Bear with me on this, and I’ll explain as best I can.
You may well want to take the basic measurements as a template, and then size up against your own tank and panels?
The white stripes are all consistently 6mm wide (maybe based on ¼ inch ?)
Tailpiece: measured vertically the blue bar = 55mm, so total height = 67mm.
Top length = 190mm, bottom = 210mm.
Short diagonal = 170mm (bottom left to top right)

- Z_decal_tailpiece.JPG (84.67 KiB) Viewed 2149 times
Side cover: measured vertically the blue bar = 50mm, so total height = 62mm.
Top right edge measured horizontally the blue bar = 36mm, total length = 52mm (the white stripes are still 6mm wide, but cut off at an angle).

- Z_decal_side cover.JPG (70.1 KiB) Viewed 2149 times
Tank: measured vertically the blue bar = 58mm, so total height = 70mm.
Vertical drop from lower white stripe to bottom ledge = 30mm.
Bottom left edge measured horizontally the blue bar = 30mm, total length = 46mm (again because of the cut-off angle).

- Z_decal_tank1.JPG (105.62 KiB) Viewed 2149 times

- Z_decal_tank2.JPG (76.77 KiB) Viewed 2149 times
I could try to get some measurements of tank decal length etc. but they might not be very accurate, and you might be better off measuring up against your own tank?
Let me know if you need more.
Rick