looking for 20meg MFM HD;s to replace a SIDER II or Sider parts

Hello I am looking for Preferably a NEC D5126 MFM drive.. or a ST-225 .. and possibly SIDER parts .. if you have any of these drives or a 20meg drive with similar geometry;; and or Broken Sider Drives you might want to sell let me know what you have and prices... Regards Mike