A friend of mine has a single speed Kona Unit and wants to make it geared. The model he has (likely 2012 or 2013 model) uses sliding dropout. He currently has single speed dropout plates without a derailleur hanger. What replacement plates are available for the sliding dropouts with a derailleur hanger? Are these paragon dropouts (or compatible with paragon), Tange dropouts, or custom to Kona?
Any suggestions on which dropout plates to use to replace the drive side with a geared dropout plate would be helpful.
FYI: I referenced all sites listed in the following question and didn't find sliding dropouts for this bike on any of them:
Determining which derailleur hanger is compatible with a frame
Current dropout looks like: