2- nylon twine
3- spray glue or needle n thread
4- your old seat insert
Pretty simple really.
Trim your Center insert with one inch of bolster material around the edge. Then fold the bolster material over and glue it or sew it to give a finished Edge to insert
Tie long pieces of twine to the metal wire in the insert.
Cut off the tabs on the back of the insert.
There is also a small slotted fabric you could put a string through instead of the Big Tab. It's right beside the Big Tab
Stretch the T-shirt over top of your seat back.
Tape your string to the end of a Sharp screwdriver
Then put the strings through the T-shirt and tie them to one of the metal pieces in the back of the seat.
In the photos I only have the top of the insert and the bottom of the insert attached. I didn't use the strings in the side or the tabs. It's kind of in an unfinished state but you can get an idea of what it will look like
And hey it's better than yellow foam snow blowing all around in your car LOL.
Anyways some photos
lol, looks messy but , just to show the process