I'm shopping for bifold doors as well. If you don't want to go custom, you may be able to buy 96x80 (4 panels) and then have an inch cut off each panel top and bottom. One thing I would highly recommend is not using the hardware that may come with the door and instead buy it from Johnson Hardware - it's higher quality. I'm probably going to go with the 1601 full access bifold door hardware. Home depot appears to sell a door that is 24x78: Home depot door
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