I replaced my elastic cord with tent/tarp hold down ties. These were at Lowes. They are a an elastic loop with a blue ball on the ends and are about 6-8 inches length of loop. Dis assembled(cut the ball off) I used the stops (metal parts)from the original cord. Stretched the new cord, cut off the excess, clamped on the stops and VOILA New tight netting! Cost was about $3.00 and the package has 4 or 6 ties in it. Fixed both seat nets and have spares.

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1986 Euro 500SEC "RUF" 9:1CR, "Rose"
1985 Euro 500SEC Cabriolet AMG Widebody
1982 Euro 500SEL "Blue"
2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
2012 Queensland Red Heeler "Squeak"
Best dogs I've ever had.