Hi Ken,
Friend of mine down here in Tassie has a water jet cutter and could make them easy. You could find a water jet company closer to you to make them for not very much money. If you have any trouble let me know and I will get them made down here and send them to you
I have had washers and other strange things made on the water jet it will cut any materials up to 500mm thick. He also cuts head gaskets etc when they are no longer available very clever
Cheers
Fatboy