Yep, I have after market seats in my Gen I. Love the seats! They are Corbeau knock offs, but look great. They required custom brackets to be made in order for a clean install. The seats set me back $249 for a pair of black on Ebay. The best $249 I've spent as they are a cool fabric that breaths and never gets hot under the sun. The wife loves them. The look great with the red and black interior we installed. Would recommend the upgrade to anyone. I'm 260# and the seats have held up without a problem for almost 2 years now. They bring the car in the the current century. Yes, they did require custom brackets to install and they do slide. The brackets cost $30.00 to make.