X-Wing Miniatures - Veteran Instincts Pilot Upgrade Icons

Saw someone using a similar type thing (possibly acrylic) on google images, though it might be a useful item to add to my X-Wing Miniatures Collection to help avoid confusion during play.

Basically, these are icons you can place on your Ship Base/Ship Pilot Card that cover the existing Pilot Score with the number you insert. They are intended for use when you are using the Veteran Instincts Upgrade which increases your pilot skill by +2. So if you were using Darth Vader (Pilot Skill 9) + Veteran Instincts, you would put the number 11 icon on the back of your ship base indicating his new pilot skill for the current squad build.