This is so e-z I can’t believe I waited so long to do it.

• Remove seats with reverse mode on drill.
• Measure seat on new fabric (use upholstery fabric)  with extra 2-3 inches all around.
• Cut new fabric.
• Add stuffing, cover with fabric, staple in a couple places to test.  Make sure pattern is lined up as you like.
• Staple all around.
• Screw seat back in.