Hi!
I didn’t know that the latest Cabriolets had ABS. However, I do know that a Norwegian-registered Cabriolet (VIN 146690), supplied new to a client in Oslo, Norway in January 1988, probably the last cabriolet supplied new to Norway, did have the later Convertible style seats, steering wheel and Lattice rims. According to what has been mentioned above it would seem this particular car did not have ABS.