Picture 1 shows the replacement cord I used, and the crimped on metal sleeves that secured it.
Picture 2 and 3. I used four number 10 washers, and looped the elastic through them and tied a square knot (retired sailor). I stuck the flat elastic into the slots on the seat back.

Attached Thumbnails

     

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2000 C230 Kompressor "Frosty"

2007 PT Cruiser
2001 VW TDI Beetle
1999 Landrover Discovery II
1971 Corvette

Gone: 97 Cabrio, 83 240D, 93 VW Eurovan, 95 Volvo 850, 93 Chevy Astro Van, 77 VW Bus, 99 VW Jetta, 74 VW Bus