7/64'' Spectron 12 (spec 12 to some) would probably be the best thing.... you can get it from several places... West, Layline... it's fairly cheap ~0.20/ft
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<br>Note that when/if you make the replacement that the line is rather slick and it would be best if you can splice it. It's not hard since it is only a 12 strand single braid. If you can't/don't splice it, you should tape the knots with rigging tape to help hold the knots.
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<br>I trust this stuff for the job.... I raced on a J 92 that had a spec 12 backstay and it was great...
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<br>Will<br><br>