One good question!!
why in the hell does our LS4s come with 1 dog bone instead of 2!?!? The LS, LT, LTZ all have them, why not ours!! wouldn't make sense for us to have them?

Anyway, I don't know the answer, but would venture to guess that it's b/c there wasn't room for the other one (big accessory pumps on the LS4). It hasn't been an issue for anyone (yet) and it makes replacing it even less expensive.

