Yup; any 8 cylinder Camaro could be ordered with U17 [required D55] and many Z/28s were. But they added $150 to the car. Z/28 required J52 power front discs [$64.25] and a 4-speed transmission [$195.40]. Positraction was neither standard or required; another $42.15. Throw in a radio [$61.10] spoilers [$32.65] and the cheapest Z/28 listed around $3,700.
May not sound like much today but it was at that time. Dealers had to be careful what they stocked. That's why most were low option.
Of the 1410 figure you stated that had the U16 option, is that just the 69 Z/28, or is that all 1969 camaros?
My car was very low on the options list 08C D80, only options- special interior group, U16, ZL2 hood, tinted glass, and Am radio, (power brakes, M21 & 3.73 Posi), out the door for $3430 !
What a deal!