They were really easy to make.
Just a board from Home Depot but to size on my table saw, then some router work on the edges, and then a couple of 1/2" holes drilled for some dowels cut on the band saw.
Used Fiebing's Leather Die for the wood stain (I find it works better than any wood stain), though I think I should not have gone so dark (but brown and black are all I had on hand).
Finished with boiled linseed oil.
I knocked them out in about an hour.
You probably can't see in my crappy pictures, but they are secured to the plaque with a black zip tie. Fits right over the forcing cone.