If I understand your question correctly...try putting a large plastic trash bag over the foam before installing the new seat cover. The plastic makes it easier to move the cover around. Then you can either leave the plastic bag in place or reach up and pull it out.
Im covering a 66 bucket. It has the pleats down the front and running lenght ways on the seat bottom. They go in the grooves of the foam and are hog ringed from the back.
I just don't know how to keep them in the grooves they keep slipping out.
If you spray the foam with a silicone lubricant, it might make it easier to get the cover in place.
65 Danube Blue MALIBU 4 door wagon, F41 suspension package, 350/330hp crate with GM Performance Parts serpentine belt system, 700R4, factory air with Vintage Air conversion, factory am/fm stereo, tilt wheel.
You need to have some wire running down the length of the groove in the foam. Then hogring the welt/backing of the seat cover to that wire in the groove. Make sure you pull it tight and be generous with the rings so the pleat doesn't have waves.
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