Compare the ones here http://www.skidim.com/products.asp?dept=1174
and match with your application.
Delco is GM's "house" brand; Prestolite is typically Ford -- that narrows things down a bit.
"For every complex problem there is an answer that is clear, simple, and wrong." (Henry Louis Mencken)
2005 X2, Viper Red, MCX, Acme 1285, PPass, rear 750 sacs, KGB, IBS, Bennett Wake Plate
(previous) 2001 X5, 1991 TriStar 190