Hello I picked up a 78 Formula that was advertised as a Trans Am roller. Went and looked at it and seen it was a clone and the owner said it had a vinyl top from the factory on it when he bought it and removed it, I told him they haven't produced a vinyl top f body since 1975 and he said let me go get the build sheet and there it is code CB7 on the sheet and the body tag and Vin all match.......So was this a special order car??