You can have Belmog to make them at you wish
Belmog
Or Morganspecialist also
morganspecialisi
There is anotherone making panel with 3 fast clips for fixing but I don't find it back so far
Or use a plastic one from a 4x4 and make an hole in the middle, easy and cheap innocent

Dada,
Plus Six "Samantha" (the wooden witch)