Polyurethane Bushings

Hello everyone.  I just signed up for this list yesterday and have my
first question.

I am in the process of ordering the needed parts to start reassembling
the rear end on my 73 Midget.  I was planning on replacing all the old
bushings in the rear with new Polyurethane Bushings.

I sent my parts request over to World Wide Auto Parts.  They had
everything I was looking for except the Polyurethane Bushings.  The
email I received from them not only stated they did not carry them,
but that they were strongly not recommend.

Everything I have been reading on different online forums say to go
with the Polyurethane Bushings because they make a big difference.  So
now I am stuck and was hoping for some input.

Thanks,

Greg