also
www.graphtec.com they sell graphite nuts (duh).
measure and record your exact size (L, W,H) before shopping.
IIRC they offer both slotted and unslotted blanks that can be shaped or modified as necessary (wear a particle mask when sanding, dust NG for yer lungs) so, theoretically, they could be made to fit just about any application.
you ever do a nut replacement before?
good luck.........duc