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Doing a little research, I see the '69 Yenko is shown with 15x7 Chevy Rally wheels (probably due to Yenko ordering COPO 9561 when it became available from Jan. '69 on), not the Z/28 15x6. I'll have to look further on the suspension, the package (COPO 9737) you mentioned was mostly about the wheels, disc brakes, 13/16" front sway bar, HD posi 4.10 rear, 140MPH speedo. It also looks like Yenko did use the Pontiac Rallye II wheels in '67/'68 and perhaps early '69, in Jan. '69 Yenko started using COPO 9561 Camaros directly from Chevy that Yenko then added Yenko stripes, Yenko emblems, etc. Prior to COPO 9561 in Jan. 1969, Yenko ordered SS 396 Camaros and swapped out the engines at Yenko in 1967, 1968 Yenkos used a COPO 427 (different than the COPO 9561), that was also likely used in early '69 Yenkos.
Clyde
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