Curved Trellis

After all the very gratefully received help about filling my cutout letterbox, another query.

Two pieces of my next door neighbours trellis fence top have been destroyed by weather and her cat.

Naturally she doesn't want to replace all the trellis tops but she has been unable to locally source the correct size of trellis.

The trellis type is a standard concave (bow I think is the other name) but the outside height now seems to be a non-standard 20 inch.

Any ideas about whether anybody still makes this size or suggestions about trellis makers who might do bespoke pieces.

Thanks

Stuart McKears

PS 1st posted this at 19:40 but doesn't seem to have appeared. Apologies if it has.