My car had an old Autopower Bolt in. It was what I had, was free, and got me on track. I got the log book in December of the last year you could use ERW tubing.

Once I had the funds, and a baby on the way, I improved every safety system, which included installing a custom, welded cage. Took it to tech, told them what we did, asked them how they wanted to handle it, and they elected to just make a note in the existing log book and stamp the new cage with the old number.

There was none of the original cage retained.