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20v spark plug replacement

I was home sick yesterday, so I decided to take a peek at the plugs
in the '91 200q to see if they were the cause of the misfire at high
boost (which I am still chasing).  I took out my brand new Sears
locking extensions (so as not to loose the spark plug socket) and
*whoa*, the plug socket doesn't fit in the hole in the head.  Hmmm...I
remembered that I had a smaller spark plug socket which was used on
some newer GM plugs, so I put it in place and *whoa*, it doesn't fit
down the hole either (but it is close).

So...what spark plug socket do I use for looking at these plugs?  Is
it an Audi-only part?  Am I left with using the handle end of the lug
nut wrench (which is outfitted for plug removal)?

Inquiring minds want to know.

John Mallick
'91 200q