Trouble finding bed accessories 6.4 w/ RamBox

[jc55]

So I've been looking for some kind of drop in bed protector for my RAM w/ 6.4 bed w/ RamBox but can't find anything. No BedTred, no BedRug, nothing. I think I might wind up having to something custom. Not really a fan of Line-X, I would like something anti-slip with some give.

Anyone got any ideas?