The backstays. These are 1/2" New England Ropes Endura 12 rated 34,000 pounds breaking strength. The original wire backstays were 8MM dyform rated about 13,000 pounds. The two dyform wires weigh about 36 pounds, and the Dyneema ones weigh less than 5 pounds including the steel fittings.

I did all the splicing myself. My rigger said it looks as good as any splices he could do.