Yep. Olds had F41 suspension which included rear sway bar with air shocks standard on the 83 (the air shocks were optional in 83 only) and 84
H/O and 85-87 442. That was it, though.
I cannot find any definitive information that the El C/Cab came with rear sway bar. Doesn't mean it didn't happen. Although I see no reason you couldn't install one.
The 1980 product information guide SAYS F41 was available on El Camino. Actually, it just states that it's N/A on Station Wagons. Thus I'm deducing it was available on El Camino, etc. But what I can't find, at least not yet, is what F41 meant to an El Camino. Was it just a bigger front bar or did it come with a rear bar too?
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