I had Millwood's chap make me a sert with the c/f weave running perpendicular, rather than diagonal, to more closely match the weave on my CC c/f rear wings. It's now close, but still not quite the same.
Also, I had the left-side stone guard madethe same length as the right, to hide the vestigial notch in the left wing for the non-existent rear exhaust pipe.
Somewhat pricey, and I unfortunately I haven't got them installed yet.
Presently have the standard Millwood c/f stone guards, pretty pockmarked up now. I use small black oxide socket-head dome nuts, washers on the backside, and nylock nuts to fasten them on.