Product Number: RON-GPZ-00-SB KIT for GPZ Radiator & Oil Cooler Guard SET SB Black Emblem Why is it necessary? How to reconcile the conflicting themes of "cooling efficiency" and "protective performance." Small stones and debris kicked up by the front tire, insects flying towards the lights... etc. These can damage the radiator core, which is made of aluminum fins. The cooling effect is lost when the fins are crushed, and in some cases, there is a risk of damaging the water line and causing coolant leaks... K1 ZK3