From The Anvil pewter letter plate. Supplied with fixings, available in 266mm x 108mm and 324mm x 108mm sizes.
Overall Size / Aperture / Fixing Centres.
266mm x 108mm letterplate / 201mm x 44mm aperture / 243mm fixing centres.
324mm x 108mm letterplate / 260mm x 44mm aperture / 292mm fixing centres.