I loved looking for those (and I'm going to check out what I missed when I go back to DL next Thursday!!!).
Unfortunately, they aren't anywhere in WDW, just DL. I think that the 50s, just like the golden ride vehicles, are only in DL, because DL has to have extra cool stuff. It's the park we're all celebrating!
Still, I feel badly for those who miss out on the goings on at DL only.
You'll still have a great time at WDW! Enjoy!