Tandem stoker stem or stem for the rear rider. Then add a pair of 25.4mm handlebars and you are away.
New Nitto tandem racing stoker stem (drop bars) seat post 27.2, bars 26.0
2Pcs Bike Mirrors 360° Rotatable Rear View Handlebar for MTB & Road Cycling UK
2X MTB Mountain Bike Bicycle Side Rear View Handlebar Mirror Plastic 360° Rotate
Hafny HF-MR081 Fully Adjustable Magic Bike Rear View Handlebar Mirror - Left
