The GTO Restoration guide lists the part #'s for GTO air cleaners. I can't tell you if those #'s match the Custom S #'s or not. If the number you list is actually on the "Keep Your Car All GM" sticker, I'd bet is the stickers parts #. I think the air cleaners # is on the bottom of the air cleaner assembly. The production date says it was for a 70 model.
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frittering and wasting the hours in an off hand way....
1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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