Mike, several years ago a friend tried fitting fiberglass panels to his TR6, to be blunt, it was a disaster!. I have no idea if these were by this Smoothline outfit.
Something does concern me about their front wings. They list the same part number for all models, but, TRF and Moss show different parts for the 69 - 74 1/2 and the 74 1/2 - 76. Both the front and rear wings come with 'mudguards included'. I assume they are referring to the returns inside the wings that bolt up to the A & B posts respectively?? Also, none of their parts are for the '76 model year, or is it they do not know enough about the car to know it was made in '76? Things like this kinda make me wonder about their quality and commitment. To their credit, they "'guarantee'a fit - absolutely". Interesting.