1980-81 Pontiac Firebird Wheel Design Blueprint - 15x7 & 15x8 Sizes, Offsets

This document is a photocopied blueprint / design drawing showing a partial view of a cross-lace (mesh) spoke wheel, drawn with centerlines and concentric rim sections. A brand name beginning with "MAH" (cut off at the page edge, possibly MAHLE) appears molded on the rim in the drawing. A small dimension table at the edge of the sheet lists diameters (approximately Ø70,5 and Ø72,8) with tolerance-like values (0.060, 0.134), though it is largely illegible in this scan. Handwritten annotations identify two contacts: John Wagner (313 575-2305, Pontiac No. 2 Exterior Design Studio) and Trever J. Brown ((313) 857-2489, Pontiac Plaza, Pontiac, MI 48053). Additional handwritten wheel fitment notes read: "Firebird '80, 15x7, 71.02 / 70.76, .34-inch offset" and "'81, 15x8, 71.02 / 70.76, 0 offset." A reader can learn the wheel sizes and offsets associated with the 1980 and 1981 Pontiac Firebird as noted by the designer, plus period GM/Pontiac design studio contact information. The document appears to be a design-development artifact rather than a service manual page.