Donut spare size

[bgsterling at bluebottle.com (Brad Sterling)]

Hi all,

        I'm on a quest to reclaim the hatch area (amps and subwoofer to be
sold in the near future).  I've been carting around a full size spare for
years, but want to go back to carrying the stock, donut spare.  I figure I
can probably get one at the local breakers, but I don't think I can trust
them to know which of the gazillion spare tires they have will fit both on
my car and in the storage hole in the hatch.  Can someone confirm the tire
size for me?  Bolt pattern is 4x100, right?  If anyone has one lying around
(preferably in the PNW since it might be expensive to ship), please let me
know.  TIA.

-Brad
'86 Scirocco 16v