Tamiya plastic radius arms (B13(2) & 14(2)), these are the standard plastic pendulum suspension parts used in Tamiya semi-trucks and trailers. AssembledCarbon Reinforced Trailer Pendulum Suspension.
Tamiya Radius Arms, Truck &Trailers Pendulum Suspension, Carbon Reinforced
Tamiya Leopard 2a6 1/16 Upgraded Metal Swing Arms
H60073T Radius Arm
Kyosho Calibre 3 Rc Helicopter Radius Plate Swashplate Guide CA 3039
ALZRC - Devil X360 Metal Radius Arm Set - Red
ALZRC - Devil X360 Plastic Radius Arm