If Home Despot doesn't have 5/4 x 8, other local yards don't carry it and this is a painted application, consider doweling and using Gorilla Glue to make a wider piece from two narrower lengths. Knock off the dried squeeze out glue with a hand chisel and smooth joint irregularities with a belt or RO sander on the show face.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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