I cannot seem to find any R-trem arm replacements for my Steinberger Spirit for under $60. I have found a few 6 mm direct insert type tremolo arms for other headless guitars for significantly less, but so far these all have a notch around the peg that goes into the bridge, and aren't smoothbore like the newer standard ones. Everything else whammy bar related I find online has threads for screwing into a bridge like a Stratocaster. Will these indented arms function with a newer model that has the hexkey for tightening it into place with a nylon bushing?
Thank you for your time and help.

