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sport seats have a "hole" in them just under the head rest . Regular seats have a solid back rest.The only difference between the two is the foundational foam (one comes with the hole, one with no hole) and the seat cover for the back rest. So if you want to change your SEAT BACK foam AND cover you can change from one to the other.
As far as the bottom seat foam, do a search on recovering seats, or go to VettEssentials.com and click on installation instructions to see what's involved.
Several memberts have trimmed the old foam and added new foam on top of the old foam before recovering the seat.It's also a good idea to put down a layer of canvas or burlap over the springs before laying the foam down.
If your seat covers are in good condition than just order the lower seat foam from one of our supporting vendors and follow VettEssentials instructions for the installation.