White Ensign makes some photoetched open & closed (failread) chocks.
Chcek with L'Arsenal on the bits, I think they may have some in resin. You have a couple of alternatives. Fitst is some Plastruc or Evergreen rod of the appropriate diameter, cit to length and cemented to a rectangular base-plate. A punched disc of styrene on top of each leg of the bit represents the flare (where appropriate). Second, with a resin ship, drill a hole at the bit location and insert a piece of brass wire. Snip at the desired height.