Along the same lines, I am wondering if any parts are interchangeable. I have a Super Record 11 rear derailleur from about 2010 that I'd love to convert to a medium cage to accommodate a 30 or 32 rear. I saw that there is a medium cage part available for a later model
https://www.modernbike.com/product-2...AaAn00EALw_wcB

Will this fit or is there another good option? Or would it be possible to keep the short cage to use up to a 30 with 52/39?