Plastic fronts paired with metal temples, like on the RX7098, are a common combination in Ray-Ban's eyeglass range. The temple arm here runs 140mm, sized to this specific square model rather than a generic length, and a compatible replacement has to match both the length and the metal build to close correctly against the plastic front.

With a plastic front and metal arms, it's almost always the temple that gives out first: the plastic front stays flexible and rarely cracks, while the thinner metal at the hinge takes the daily wear of folding and unfolding. That's why an aftermarket replacement arm on its own is usually all the RX7098 needs, with no reason to touch a front that's still doing its job. It's worth confirming the plastic front hasn't cracked at the same time, since that would call for a different kind of repair altogether.