The body design feature that determines if a vehicle is a roadster is the the top. If it looks like your model,with a foldable fabric top over a two seat interior and a fixed(non-folding),body colored windshield It's a roadster. That same basic size body with a steel roof with two Windows on each is a five window coupe. If there is only one side window in that steel top it's a three window coupe when you count the windshield. I hope that helps a little.