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B5M laydown gearbox designed to use the B6 motor plate.
Uses #91606 top shaft and 5x10 bearings. You will need Left gearbox: http://shpws.me/MzvO , Right gearbox: http://shpws.me/MzvQ and this chasis+battery strap: http://shpws.me/Ixf9 . You can also use this strap requiring two holes on the chassis: http://shpws.me/KFus
It is recommended to use a low total tooth count (pininon+spur between 99 and 102)so the motor sits low. For example 30-69 for stock and 21-78 for mod. Spur gear maximum size is a 78T. Otherwise it could hit the C arm mount.
CAUTION: 3D printed parts haven´t the precision that molded parts have. Some gearboxes work perfectly, some require a little bit of sanding.