I've got an '80 z28 and I would really love to have T-Tops. I've heard if you install aftermarket T-Tops that they end up leaking usually. Is that if you do it yourself and don't do a perfect job, or is it just a common problem no matter how well the job is done? Basically I'm asking if I went to a shop and had them do it for me, as long as they know what they're doing, do you think it would leak? Also, does anyone have any estimates for the job? Thanks