There is a slit in the foam, not all the way through, between the flat part of the seat and the bolster. A thin steel rod slips into a pocket on the bottom side of the seat cover, along the edge of the bolster. A hog ring is a clip that is used to fasten the seat cover to the springs. I have a lot of the clips and the pliers to install them if you need them. The hog rings go around the outside edges and around the rod at the edge of the bolster. The rod is pulled down tight into the slit and hog ringed to the springs below. This gives the center section a bit of curve as it's pulled down and really defines the bolster.
You need to look at your new seat covers and see if they have that loop of fabric between the center section and bolster on each side. Hopefully that will tell you what kind of foam you need.
Hog rings, they're like the rings farmers clamp into a hogs ear to mark it.
Wish I had boxes like that showing up at my door!
__________________
Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
|