As in the original from Ghost Cell, 15x3mm Neodym Magnets can be used. For mounting on the Wheel, the Original Screws of the QR2 Connector can be used.
Additionally, I added a second design, for backloaded, stacked magnets. The cavity offers enough room to stack 2 magnets in it. It avoids direct contact between the magnets from the shifters and the mount. Strenghtwise, for my feeling, this design offers the same as the front mounted design.
The counterparts for the shifter levers can be used as offered by GhostCell ( in addition with the M3 screws).
I printed the mounts with 35% infill in PETG.
The author remixed this model.
I remixed the original design from GhostCell & the remix of Ramón Heras in regards of the Magnet Holders on the Wheel for the P1 V2 for the usage of the QR2 Quick release.