I am doing the same switch right now on my 1970 Blazer for the same reason. The fronts just needed the holes redrilled and they bolted right in. Some of the holes hit on a cross member, so you will need to cut a little for clearance for the bolt. Also, you will want to use a front set that does not have electric on the passenger side. That way the seat will slide forward with a pull of a lever and you will not need to wait to run the power seat forward when the kids need to get in the back. My front set came from a 2004 C2500 extended cab, so they were built to let people in the back, but it still does not slide as far forward as the original Blazer seats. I am getting my rear 3rd row seat on Friday, so I will be able to tell you more then. I did measure a set from a 2002 Suburan, and size wise, they are a perfect fit. The seats clamp in, so you may need to get the mounting boxes from the donor rig that you get the seat from. There is a guy on ebay that sells a mounting kit that might work as well.