Paintable inserts for the inside of the arch and jamb.They were made for 1/2" and 5/8" drywall.
Does away with having to bend drywall and fancy corner bead.
Never have I seen a prefab arch except in commerical work where they were very fancy and ornate.Big $$$$.
Framing an arch in an opening is why a Carpenter gets paid.Luck
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