RS is the same kerf, and chain body as .063, just has stepped down drivers. RS Pro is the Narrow kerf. If all else fails I can probably pick some up at my dealer.
Edited for my own stupidity: You already know that @PA Dan might have some.
If not, The Saw Doctor LLC (tsdllc) on ebay will make you custom loops for a reasonable price. I've purchased a few different chains from him. Great seller in my experience.
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