This is because it’s has to be smaller than the sitting point on the jack. Cushion size: 4, (3.5In) thickness 7mm.
NEW Jacking Pad Rubber Trolley Jack Cushion 3.5" x 7mm Lifting Safety Grip Pads
SEALEY 3000CXD/JP JP04 RUBBER TROLLEY JACK LIFTING SAFETY CUSHION PAD 3000CXD
Rubber Trolley Jack Pad Pinch Weld Floor Jack Lifting Puck Adapter Classic
Rubber Trolley Jack Pad Pinch Weld Floor Jacking Lifting Puck Classic Adapter UK
Sealey Safety Rubber Trolley Jack Pad Type B Lifting Jacking 99-106mm Saddle