Jack, Side Wind Square 8,000lb. with Custom Mounting Bracket (5'x10' F | www.OrderTrailerParts.com
Buy Now the Ring Lock System Scaffold Screw Jack W/Base Plate – ScaffoldExpress.com
FC Stock Jack Mounting Plate – LRB Speed
AEV Jack Base - JL/Gladiator | Jeep Gladiator Jack Mount
2 Ton Jack Mount & Skid Plate / Harbor Freight - Solo Motorsports
MetalTech 24 in. Adjustable Scaffold Leveling Jack in Galvanized Steel with Heavy Duty Base Plate and Wing Nut Screw (4-Pack) M-MBSJP24HK4 - The Home Depot
Source U head adjustable scaffolding screw jack base plate/swivel jack base/Thread rod jack on m.alibaba.com