Did they build a vinyl top 68 Barracuda FB?

The only one I have ever seen was on a '69 fb. IIRC, it was referred to as a slickback.

Vinyl tops were more common on the notchback coupes. 69 saw the addition of the paisley mod top to the solid palette of colors.

I am away from my texts at the moment, so can't say if the vinyl roof was available on the fb in MY 68. The Mod Top was definitely a 69 & 70 option only.