the only V251 (R class) implementation of steering wheel shift buttons I find in the EPM are duals (up and down on both buttons). They are pinned differently (common is pin 2 instead of pin 1), but could easily be changed to be plug compatible with the amg aluminum paddles (and the r170/crossfire paddle kit). I do not know how they are retained , but I would guess by a screw which would make their installation feasible.

Chris