WTB: Polyurethane A-arm bushings

[Nathan Belo <belo@eskimo.com>]

I have owned this car for 3 years and this is the 3rd time I have to
change the worn out a-arm bushings that cause a vibration above 60mph.
What is causing this?  I have Eibach springs with Sachs/Boge Turbo Gas
shocks paired with 15X6 Ronal R8's with 205/50 15 Dunlop SP 4000's.

Where can I buy these things?  I'm told I'll have more steering response,
but the sacrifice is a bumpier ride with more noise.  Any experience with
these things?

Nathan Belo
'88 90Q 161K miles Tornado Red, clear turn markers, Motul racing brake
fluid, s.s. braided brake lines, & x-drilled ATE rotors

P.S.  Is it the Quattro club track driving about 4 times a year that adds
to the wear and tear?