The Ray-Ban RB4369M has an irregular, sculpted front, and its 145mm metal arms run longer than the 140mm standard used across most Ray-Ban lines. This aftermarket set matches that extended length and the all-metal build, so the hinge and the curve into the temple tip line up with the factory geometry instead of a shorter arm borrowed from a more conventional shape. It's worth checking the 145mm figure specifically before ordering, since a standard 140mm arm can look close enough at a glance but will leave the frame sitting slightly loose once fitted.

Irregular fronts like the 4369M put uneven load on the hinge, because the frame doesn't sit symmetrically the way a round or square front does, so one side can loosen faster than the other. Check both hinges periodically rather than assuming they wear evenly, and watch the screw rather than the arm itself, since that's usually where play shows up first. A loose hinge on only one side is a normal pattern on asymmetric frames and doesn't necessarily mean the other arm needs replacing too.