Enerjet by Aerotech, Arreauxbee-Hi, Part 19, Fin Sticker Template

The AT-022 fin stickers go on both sides of the three fins. Make a template out of cardstock so all the stickers will be aligned.

It's hard to see with the white on white - 

There is some cardstock behind the fin. Set the left straight side of the cardstock into the root edge.

Trace around the fin with a pencil

Here's that cardstock tracing with a sticker window cut out.

The cut out window position is approximate using the box photos.

Lay a piece of clear Scotch tape over the window and cut out the window. You can see it if the pic is enlarged.

The sticker will be dipped in water to allow repositioning. The Scotch tape window border will prevent the excess water from soaking into the cardstock.

Here's how the window fits the AT-022 sticker. 

The bottom trailing edge has been cut off the template for easier alignment on the trailing edge of the fin.

The template can be flipped over and used on both sides of the fins.