Need MORTISE replacement part for mortise lock / sliding door handle/lock replacement

A home owner from California says:
Hi we need this mortise replacement part and cannot find it anywhere online. Do you sell this replacement part? (It's the white mortise lock frame holder in photos that the lock fits into and that entire 2-piece unit fits into our IWS sliding door).
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Tom from SWISCO responded:

Thanks for reaching out to us. Your mortise looks like a match for our 82-218, but we unfortunately don't sell the white cover. That's not really part of the mortise assembly. It's probably more accurate to say it's part of the door; with that in mind, you would have to contact the original door manufacturer to see if they can supply this exact piece.

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