These are more coming out of necessity for my daily driver / track car, I will be manufacturing lower control arm (not the large "D" bush ATM) & rear trailing arm bushes from Delrin.
They will come with plated steel crush tubes.
Delrin is significantly harder than urethane, so will provide more NVH through to the body, but alignment changes due to bush deflection will basically become non-existant for these pivot points.
Result will be a firmer, more responsive ride.
Pricing not finalized....but expect around $100 for a kit to do both front lower control arms.