Ray-Ban's Caravan shape runs a squarer profile than the brand's aviators, and the RB3136 version takes a 140mm metal arm to match — the length and material this aftermarket pair is built to. At 140mm it's shorter than the 145mm arm used on some other square-metal Ray-Ban models, so the two aren't interchangeable even though both are described as 'square.'

Caravan-style metal arms are cut relatively thin to keep the frame lightweight, which means they're more prone to bending slightly out of shape from being folded one-handed or stored face-down than to snapping outright. A gentle bend is usually correctable by hand at the hinge; it's a cracked hinge, a stripped screw, or a bend sharp enough to leave a kink in the metal that actually calls for a replacement arm.

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 3136 is broken or scratched, or buy the pair if both need replacing — either way they match the 140mm length exactly.

Are these official Ray-Ban replacement parts?

These are compatible aftermarket arms, independently produced to match the 3136's hinge and 140mm length. They aren't manufactured or supplied by Ray-Ban, just built to the same measurements so they attach correctly.

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

These arms are made specifically for the 3136, matching its 140mm length and Rectangle hinge design, so they attach to your existing screws and hinge without any filing or adjustment needed.

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

A new 140mm arm includes its own hinge barrel, so if the wobble is coming from worn threading on the arm side of the 3136, replacing it usually restores a snug, tight fold.