I'd have to agree with the others on this, the findings are inconsistent across models. My 94 K1500 has the hooks and lower valance (spoiler), the 93 C3500 has no hooks but I always assumed it had a spoiler originally even though it's gone now. These plastic spoilers just tend to get torn off sometimes.
Going to have to dig some more on this, if it was optional then there must be RPO for it; spoiler alone and then spoiler with front hooks.
I would assume that if you had the fog lights you would have had it with a spoiler....
Steve