The preceding summary shows that there were 8,322 Cutlass Supremes built with 455s (L33+L31+W32) but only 7,122 were SXs. That indicates that there were 1,200 Cutlass Supremes built with 455s (L33s) but did not have the cutouts in the rear bumper, exhaust trumpets, or the SX badge on the front fenders (option Y79).
NOTE: From Terry Divelbliss (May 6, 2019 Facebook post) "The Y-79 SX production number straight from the Oldsmobile mainframe printouts is 7,122 (9.4% of 4200 series production) through June 1970. 231 (2.8% of 4200 series production) were built in June. There were still a couple weeks of 1970 production left into mid-July, so a few more certainly were built. Kurt Shubert provided that info to me in 2012"
Note: Option L33 was available until February 24, 1970 – and was replaced with the L31 effective February 25, 1970. Concurrently, the L31 was not available with the Holiday Sedan or the Cutlass S.
PREVIOUS PRODUCTION NUMBERS
PRIOR TO NOVEMBER 2016