I bought mine from xenonmods.com and asked them to send me the same size as the lettering on S calipers. You can also pull a wheel and measure your white paint on the black caliper and match that.
Mine are doing fine and have lasted a long time, even though I heat up the calipers a LOT and they are not clearcoated.
I would not be surprised if all of the sources you listed are using vinyl lettering and it's identical. If so, go with the cheapest source.
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