single plate clutch mechanismâ b b type b compatible with goldoni for walking tractors transcar tractor (transporter) small tractor â models idea 20 dt (normal gearbox) 25 rs 33 224 226 228 230 233 512t 520t 521t 926 933 dt 933 rs â characteristics single plate 㘠187 mm 3 levers â code: â 50412 original code: â 2.020.021 â em