They are aftermarket urethane bushings.
you "should" always replace stretch bolts and nylok nuts.
i have a set of fancy red dog bone bushings.
got them from a friend for free, slightly used. but other than that, idk if they are OEM or aftermarket. i think they're Poly urethane
so if somebody could identify these that would be awesome. or if they are even worth installing.
also, i was thinking about installing them tomorrow and i was wondering if the Dog Bone bolts are re-usable or not. i looked them up in my Bentley and on page 10-12 it says "always replace", but on page 40-3 is does not say so.
i know the Bentley also says "always replace" the axle nut. and i always re-use those with out any problems.
so if somebody could clear this up for me, it would be greatly appreciated.
thanks in advance.