Paul,
          Now have a new computer with no previous memory, hence my
inquiry.  Where can I get the above coils at a reasonable price. Recall
you had a source for around the $25.
                       Neil.
http://www.buycheapr.com/us/result.jsp?ga=us2&q=ac+delco+coil

I don't think you want the 581. I think you want the 585 which
is the latest version.

IMHO I would use the RX8 coil instead as it is designed to fire
twice as often.

Paul Lamar