Ever notice when Google'ing Chevy details you often come across old threads from here? . Anyway while searching another topic I found this old thread...check it out. .
https://www.yenko.net/ubbthreads/show...0/fpart/2/vc/1
If you can find the guy 'youngtto' in the thread it sounds like he may have/had a stash? . Says early but maybe worth a whirl? .
~ Pete