Went to Overtons to buy a new cover for my '90 ts comp. Selected 1990, selected Supra, from model selection could choose ts6m comp skier or ts6m closed bow. looked at both and when I selected closed bow it also had the letters I/O. Did Supra build a inboard / outboard boat? My boat is a direct drive ( 1.? to 1 ) trans tournament ski boat. I assume I should buy the cover for comp skier. Any comments?