Led Lights

I saw these as well, which I assume are the Y style you referred to?

Yup.

And just for my own curiosity, these were the original style, correct?

Yup.

So are the Sylvania Zevo's still the only thing remotely worthwhile in the LED market for our taillights?

Yup.

Seems like the latest(?) Philips Ultinon might still make for a decent reverse light

Maybe, depending on which reversing lights we're talking about. Nope for most of them.