Replacement rear wheel arches

Both of my rear wheel arches are rusting. I spoken to friend of a friend who works at a body shop. He said the fastest and most long lasting repair is to cut out the rust and glue on a replacement wheel arch. But he does not know if there are such thing available. I did some search and can only find replacement arches for the 3.

Does anyone know if it is available for the 5? Would one or the 3 fit?

My rusty arch, same thing on the other side.

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