Leaf spring bushings: polyurethane vs nylon

I recently came across leaf spring bushings for the front eye that are nylon,
this is for E-body 1.500" OD bushings.
I never heard of nylon for a bushing. Will it last, or is it strictly "trick", some temporary advantage/property ?

Nylon would be new to me too.

Delrin is another story. Looks like nylon, but a different animal. Is that what you are seeing?

https://www.speedwaymotors.com/AFCO-20229N-Nylon-Front-Eye-Chrysler-Type-Leaf-Spring-Bushing,23536.html

They’ll translate more road noise and vibration from trunk area.

I noticed that just changing from rubber to poly. Nylon would be worse.

Better for handing and drag racing though.

Not sure about the different animal comment, they are definitely of the same family, delrin is mainly tougher, you cant tell the difference by the naked eye.