A snapped or loose temple on the Ray-Ban 4037 needs an arm cut to the same two specs Ray-Ban used: 130mm and molded plastic, shaped for the 4037's square front. This aftermarket pair follows that spec rather than a general 'short plastic Ray-Ban arm' fit, since 130mm is on the shorter end of what the brand uses across its square plastic models.

Plastic arms this length tend to fail before the front frame does, simply because the hinge end absorbs repeated flexing that the front rarely experiences in the same way. A crack near the hinge or a stripped screw hole are the two most common issues, and neither affects the front frame or lenses. Where that's the case, replacing the arms is the more economical fix than a full replacement frame.

Frequently asked questions

Can I replace just one arm, or do I have to buy both?

You can order a single side if only one arm on your 4037 is broken or scratched, or buy the pair if both need replacing — either way they match the mm length exactly.

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 style of the 4037 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 4037 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 mm hardware itself.

My hinge feels loose — will new arms fix that, or is it the frame that's worn?

A new mm arm includes its own hinge barrel, so if the wobble is coming from worn threading on the arm side of the 4037, replacing it usually restores a snug, tight fold.