I have a legend mat in the back and it came with nice diamond plate thresholds for the passenger slider and rear doors. There's enough of a turn down that it should cover up the edge of your plywood nicely. I ordered from Inlad truck and van company. Maybe they'd sell the aluminum thresholds separately. Their number is 1-800-377-5652.I looked in Home Depot but found nothing worth mounting. Legend fleet solutions has some nice diamond plate custom ones they make, but I can't seem to connect to their website to find a dealer here, or even a phone number. I could drive over to Ontario to their factory in an hour, but would like to at least call them. Anybody have it?