Just bought some of the standard plastic ones at Bontragers (sp) in White Pigeon, MI. They also carry a metal version, but with a little different hole pattern. The plastic ones were $.50 a piece. The metal ones were $1.00. I believe they sell on ebay. Amazon has the plastic ones for $5.96 for a pair.
2014 Chevy CC Duramax 4X4 Long Bed
2017 Cedar Creek 36CKTS
MORryde independent suspension with disc brakes