Myr, this is my same problem - while I like the stickers I ordered, they are not fit or meant to go on the armor, sadly.
I knew that before when I looked at dimensions.
Bit pity though, I would have loved a small version to be able to put on my armor.
I don't get this obsession with stickers and having to deal with "not the right size".
And I would NEVER, really NEVER put a STICKER on my armor. I want the thing to look as if it was painted. So it should NOT have any thickness or an out-of-place-God-damn-ugly-white-border-running-around-it at all which is the dead give away for NOT being able to PAINT the design you waned in the first place. That's why we have water-based decall sheets.
Do you have an Inktjet or a Color Laser printer ? Yes ? Than you can make your own stickers. Simple as that. In any size you want.
You buy a bundle of decall print sheets, either with white or transparant background. If you have a very dark background, choose a white-background decall sheet.
OR you choose a transparant one, and you can put that on a -dare I say it- sticker with whatever color you like. Want a metalic look ? Take alu-repair tape, put the ready made decall on there. Thing will look all nice and shiny.
You print the design you want in the size and quality you want. Slap it on the surface you want it to be, either with or without a underlying layer under it.
Want another color ? Take whatever you can find as the thinest tape, spray paint the surface in the color you want and again apply the decall on there. You can make the thing look like any color you freak'in want.
And it costs next to nothing.
Be sure to fixate them with a dash of clear varnish, as decall are pretty vulnerable as-is.
Done.
PS : it is VERY important you choose the correct decall sheet for your specific printer. They can be had in Laser and Inktjet versions. Running the wrong version will in best case result in a bad quality print, in worst case it can DESTROY the fuser of a laser printer and in fact many laser printers do NOT like things like decalls. Rule of thumb : if you have a HP laser printer and it has a setting for transparancy sheets or photo-glossy paper, you can run these decall sheet no problem. Most Canon laserprinters will do the same (no wonder, Canon makes the optical engines for most HP laser printers). If your printer comes with a warning that no "photo coated paper" or film can be used (most Brother laser printers, ALL Samsung laser printers, not sure about things like Kyocera or Oki) I would not advise trying it unless you can deal with a total failure of the printer if things go south.