Powerflex Polyurethane Bush kit for Caterham 7 (DeDion With Watts Linkage) Large Lower Wishbone Bush 1/2" Bore - PF8-901 - This bush is suitable for Road and Black Series applications. Cut-away image of PFF8-901 low friction bush. Shows polyurethane bush, low friction bearing and stainless steel sleeve. - Bush Size: 1/2 bore" - PRICE IS PER CAR KIT, NOT per bush. Powerflex usually price their bushes singly, but we have combined the QTY and price to keep it simple for you!