Searched through a bunch of threads and essentially came up with the two part numbers of :
Limited Fender Flare / Cladding Removal and Re-Install
9090467036 - blue clips
9090467037 - red clips
it does appear that they aren't the actual factory clips or they superseded by Toyota at some point.
The above thread fails to mention the part numbers for the metal(?) rivets that go underneath the Limited Flares on the quarter panel and front fenders. Does anyone know the part numbers for them? Or is this just a rivet that is commonly found at a hardware store?
