I don't think they were imported to the USA but it's called a "J top" and are available in the SWB across the pond.
A parts supply company called Milners in England might have them. <img src="/forums/images/graemlins/patriot.gif" alt="" />

87 Raizer, 4.3V6, Mod TH700R4,231CHD, detroit rear and LSD front, bouncy seats, 2" lift and 32x15 BFG MT tires.