Next dig out your seat cover and take a look at the bottom.
In the first pic I'm pointing at the listing sleeves.
These will get a wire rod inserted into them, then get hog ringed down in the channels in the bun to the listing rod that is attached to the springs. This is what creates the "tuck" that creates the bolster definition.
The 2nd picture is of a reference cut in the cover. There are a whole bunch of these throughout the cover, they are used for lining up panels when they sew them together- they ALSO are used to mark the centerlines of some panels- in this case it shows where the center of that main panel is... locate that same centerline on the front edge of the seat and mark it with a sharpie. Knowing where the cover mark falls against your reference mark on the bun will help you keep it straight.
Next cut yourself a few wire rods (i use paper covered wire here, but you can use a coat hanger, or 18ga wire from a hw store... Lay them into the channels in the bun as a guide for how long they should be.
Lay the cover over the bun with it folded inside out...
Lay the rear flap over the big frame horn/kick up in the rear to center the back... use the notch in the front of the cover and your reference mark in the bun to center the front.
Now hold the cover in place with one hand so it doesn't move- fold the bolster vinyl up and TUCK the listing sleeve into the bun. Mark IT in the same places you marked the bun.
carefully and Without moving the cover do it again on the other side.
Now you have reference marks so you can wrestle with installing hog rings, and still know the cover should be centered as long as you line up those marks when you hog ring the cover down.
Pull the cover back off... install the wire rods in the listing sleeves, reinstall the "wave" wire for the rear sleeve of the cover... if you didn't or couldn't save the original- go ahead and cut a new one (use the seat frame as a guide for how long it should be, not the sleeve in the cover.
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