The MK2 Plus, MK 10 and later; i.e. 14/16/17/18/20/25 all use the same Universal Yoke retainer: SP P/N 10-103-115, so any DIN replacement will fit those models. For some reason, the yoke retainer part number for the MK15 is different (10-600-104) However, that may have just be an transitional part as the MK15 was a transition between the 10 and 20. The retainer may have later updated to the Universal retainer. I only have an older parts diagram for the 15 rev date 12/97
Halocline or Buddhasummer might be able to verify the 15
Edit: I just checked the part numbers for the MK10 and M15 DIN knob retainer and they are the same: 10-400-107 so yes, the DIN for the MK15 should fit all the newer models (MK10 through MK25 & MK 2 Plus.)