https://www.avadirect.com/RP-RAIL28-VS-Heavy-Duty-28-Rail-Kit/Product/7382235
iStarUSA RP-RAIL28-VS Heavy Duty 28" Rail Kit | AVADirect
iStarUSA RP-RAIL28-VS, Heavy Duty 28" Rail Kit, works with V-2-M8SA, V-3-M16SA, and V-4-M24SA Chassis
heavy dutyrail kitistarusarpvs