Radiator Fan Shroud Kit Fan shroud kits are for use with engine driven fans on aluminum radiators. This kit includes 1 fan shroud, 1 fan ring, 6 shroud to fan ring mounting brackets, 18 stainless steel machine screws and self locking nuts, and 1 flat tab. Features a 3" collar that can be trimmed to fit. Offers choice of fan positioning - off center, side to side, and above radiator. Includes fully formed shroud of .063" lightweight aircraft aluminum. Adjustable collar, adjusts for 15-20" fan diameter.