Lower Cab Door Hinge Pin Oversize 8.5mm 55-67. 211-831-421A 211831421A £7.00 Quantity: at £7.00 each Add To Basket 8.5mm OVERSIZE Bottom front door hinge. Fits all split bus 50-67. Originally the pin is 8mm, but wear over the years, so this 0.5mm oversize one is perfect when there is some play, just buy 2 new drill bits (8.25 and 8.5mm) and use them to ream out the hole. Made from mild steel as were the originals.