David,

No, the checkers are not stock. Here's what I did.

Went to a local sign shop and brought a wing panel with me. Told him what I wanted to do. My original plan was to have him cut 2" squares for me and I would place them. He told me I would be crazy to attempt THAT and suggested that I allow him to put them on a carrier sheet. I followed his advice and he put the carrier sheet on in about 10 seconds. Got home, used the wing as a pattern and cut the sheets. Then, lightly mist the wing and sheet (minus the backing) with windex. Lay it up and position. Use a bondo spatula or an old credit card to squeege out the excess windex. Trim edges and you are done. Total time 1 hr. Total investment $20 with enough left over to do the underside of the stab at a later date.

Really helps with visibility.

Cheers,
John