Programmable wiper relay part # question

["Craig D. Niederst" <niederst@telerama.com>]

I am interested in upgrading to the programmable intermittent wiper system
in my '92 100S. Unfortunately, there appears to be several different relays
for Audi/VW for the programmable wipers. These are the part #'s I've come
across so far:
1HM-955-531-A
1HM-955-531-B
1HM-955-531-C
3B0-955-531
Any of these look like the correct relay for a '92 100? Who has the best
price on these relays? I believe I've seen an ad for the upgrade Wolfsport's
page for about $30. Sound like a good price, or is there a better source?
TIA.

Craig
'92 100S (71k)