Ha! I thought I had sourced this a few months back.
Valvoline,the maker of Zerex, told me it's not available except under private label. We all know who that is.
Supposedly the G-05, which is also low silicate, is to be used, they claim to stand behind it's interchangeability although I never saw it in writing.
The stories of Saab blue being cheaper are false in my town.