c.rogan, Do a search for "sliding suburban windows". You will find that there is an extensive thread on this subject with many contributors including me. It will answer all of your questions including where to buy your materials. I found that installing these windows is an ordeal and really frustrated me. In this thread you will find pictures of the plywood jig I made for forming the run channel. Good luck and prepare for some setbacks. If you have specific questions I will be glad to help.
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