They're steel. You should be able to get some tube and make replacements fairly inexpensively if you're hand with a mig and angle grinder. You should be able to cut off and reuse the bushing tubes on the damaged ones and probably will have to replicate the other end. Just make sure you get decent tubing. If there are any local dirt track or drag racers around you, you may be able to pick up some tubing pretty cheaply from them, they may even do the bends for you. Showing up with a couple of 6-packs at beer thirty always helps seal the deal.
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