A couple of old school garrett books & Flyers from 1987 on ebay.
eBay Motors: Buick GN Turbo in Garrett Turbo Booklet / Flyer C (item 330076303300 end time Jan-22-07 10:33:49 PST)
eBay Motors: Buick GN Turbo in Garrett Turbo Booklet / Flyer C (item 330076303300 end time Jan-22-07 10:33:49 PST)