RB4253 combines a plastic front with 140mm metal arms shaped for an aviator profile, and this aftermarket pair matches that curve and length, so the temple meets the plastic hinge the way the factory arm did. Getting the arm right here means matching both the aviator curve and the plastic-hinge fit, not just the overall length, since the two materials meet at a specific socket shape that a generic metal arm won't necessarily match.

Because the front here is plastic and the arms are metal, the two age differently — plastic can fade or yellow slightly with UV exposure while the metal arm holds its finish. If only the arms look worn and the plastic front hasn't changed shade, replacing the temples alone keeps the pair looking consistent. Checking the fit under daylight rather than indoor lighting also gives a truer read on whether the front and the new arms actually match in tone.