Ray-Ban built the RB3603 around a 140mm metal temple arm matched to its square metal front. A compatible replacement needs to hold that same length and finish, since the RB3603's fit depends on both arms closing evenly against the front rather than one running long or short. Even a small mismatch in either measurement tends to show up as a visible tilt once the sunglasses are worn.

Metal-on-metal contact at a squared hinge tends to show wear sooner than on curved styles, with the finish thinning right where the arm meets the barrel. That's usually the first visible sign an RB3603 needs new arms, well before the rest of the frame looks tired. Replacing the pair of temple arms at that point is a straightforward aftermarket fix, and it leaves the metal front and lenses untouched.

Frequently asked questions

How do I know these arms will fit my Ray-Ban frame?

These arms are made specifically for the 3603, matching its 140mm length and Square hinge design, so they attach to your existing screws and hinge without any filing or adjustment needed.

What material are the arms made from, and will the color match my frame?

The arms are molded in an acetate or metal finish that matches the Square style of the 3603 closely, though very slight shade variation is possible since they're independently produced as separate aftermarket parts rather than cut from the same batch as the frame.

Is it worth buying new arms instead of a whole new frame?

Replacing both arms on the 3603 costs from €26.95 with free worldwide shipping, far less than a new frame, and it's backed by a 3-year warranty against manufacturing defects on the 140mm hardware itself.

Are these official Ray-Ban replacement parts?

These are compatible aftermarket arms, independently produced to match the 3603's hinge and 140mm length. They aren't manufactured or supplied by Ray-Ban, just built to the same measurements so they attach correctly.