If your building it specific for your Cobra I have seen tie downs that go over the tyre, these could be spaced out corrrect for Cobra wheel base.
With your car being so low, will you need to go with a tilt base?
Also these look good, I would be a bit concerned over them being single axle.
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.