For making parts like this look up established plastics factories that have the equipment in place. Moldsmiths 156 Mushroom Blvd Rochester NY, 14623 is a great company to work with as far as injection molding is concerned.
Loranger Manufacturing, Warren, PA. - High temp thermoset and thermoplastic experience of over 60 years
Whirley Industries, Warren, PA - usually works with food grade plastics; however, they have the large cincinatti machines that would be able to hold the heats and pressures for high temp zytel.
So what's next?