I've used Shapeways for various Procat parts, including castle to hex wheel adaptors, which take a lot of torque.
https://www.shapeways.com/shops/3DJF
If someone has a spare wishbone and possibly pivot pins they can lend me (I assume they are symmetrical), I could get it modelled up for printing - I use Pro/e for a living.
Wishbones are essentially flat and thin, so print cost shouldn't be astromical for a trial.
Cheers,
Dan.