<V8> driveshaft donut

[Tim Gortner <Tim.Gortner@pobox.com>]

Hi all: :-(

Got my '90 back from Rietzl in Norwell, Mass. yesterday and they
diagnosed a "BRRRT" sound on hard acceleration as the failure (worn,
105k miles) of a rubber bushing near the front of the driveshaft.  The
service guy Larry was flabbergasted that Audi only sells the donut
attached to a complete driveshaft assembly for $800+.  Is this the only
way to fix this problem?  Is this something which needs quick attention
or is it just an annoyance? Does anyone have any ideas on this?  

TIA.

Tim Gortner
Marshfield, MA
'90 V8Q
'90Q20V

PS:  Please cc: me at work if directly answering: tim.gortner@fmr.com.
Thks.  :-)