My red 5S has the Byar boys double adjustable (or Alden, something like that name). They work fine for me, and just adjusted them slightly firmer a few months ago although I would have to check the numbers on the dials. They were bought years ago for the car, so I assume they are the same double adjustable, but maybe not. I would give them a call, they are always good with me straightening things out if something doesn't work well.
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