Seat Concepts seat has stitching down the top side edge, front to back. The edge is sharp enough to cut off circulation to my legs after about two hours, sooooo...
I took the cover off, and took a hasp file to remove foam to shape it skinnier, side to side towards the back of the top edge, and to remove foam to make the top edge "rounder" all over. About an hour for all that.
But, two trips to the HW store. Once to get smaller staples for the existing staple gun, and another to buy a new staple gun with new staples. Who knew that staples were manufacturer specific? (I had an older 'gun from my dad, and nothing fit it). Then, another half hour to fix the new gun when it broke (it threw out a small spring, whew!)
Now to wait for below 110 deg. temps for a ride.