Another 1971 ad, this one for a Yenko seat. The mention of a Yenko Stinger refers this time to the new Chevrolet Vega, which Yenko also modified.
For what it may be worth, day late and a dollar short, my first brand new, ordered from the dealer car was a 1973 Vega GT. Fully loaded, 4 speed, posi, etc.
I wanted to auto cross it, so we welded in a roll bar with braces back to the rear wheel wells.
Saw the Yenko ad, and bought front and rear spoilers and the “anti-hop” bars. Maybe they were intended for non-posi cars, but I broke so many of them that I felt the Yenko test team.
I got replacement front and rear brackets, replacement bars (one set with screw-in heim joints front and rear.
Regardless of what combination, they were junk.