I went to the GM on-line web site and bought the E.O.S in the 16oz bottles that I think you're looking for. GM stopped making E.O.S awhile back but brought it back after so many people asked for it. The new part number is 88862586 and here's the link to the GM web site where I bought mine.

Richard

http://www.gmpartsdirect.com/results.cfm?singlepart=1&partnumber=1052367