At 145mm, the RB4354's acetate temple runs longer than the metal styles in this catalogue, matched to the model's square acetate front. A compatible replacement needs to hold that length and the acetate build, since a shorter arm changes how the frame sits well before it becomes visually obvious.

The RB4354 shares its 145mm acetate temple length with the RX4354V, its optical counterpart: the sunglass and eyeglass versions use the same arm dimensions, just built around different lenses. Ordering by the exact model keeps the fit consistent either way, and it means a compatible aftermarket arm sourced for one version will generally suit the other too, provided the acetate finish matches. Buying both arms as a pair, even if only one has failed, keeps the fit even on both sides going forward and avoids mismatched wear later on.

Frequently asked questions

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

A new 145mm arm includes its own hinge barrel, so if the wobble is coming from worn threading on the arm side of the 4354, replacing it usually restores a snug, tight fold.

What if the arms arrive and the hinge doesn't line up with my frame?

Because each pair is listed against a specific model, in this case the 4354, mismatches are rare, but you're covered by a 14-day return window if the 145mm arms don't align with your hinge.

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

Replacing both arms on the 4354 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 145mm hardware itself.

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

These arms are made specifically for the 4354, matching its 145mm length and Square hinge design, so they attach to your existing screws and hinge without any filing or adjustment needed.