The Arctic Grille Covers are not inter-changeable, that is those slots, I have found, are differen't from cover to cover. So if your going to mount one, hang onto it & protect the lense covers when in storage. That said, I get it in place, centered & mark through the slot with a felt tip pen, the two centered. Then hold the loop in place & drill the holes, etc. Mount the cover on the 1st two, then stretch it to the side & mount a couple more, till you get it in place. I've never had a manual or seen one. If you get the plastic lense covers muddy, use plenty of water to clean them, or they will scratch up. Other winterization tricks, if you have a hot water heater for the cab, is to plug the scoop with a rag & divert the air intake, into the engine area (fuel heaters exempt).