Tubular Upper And Lower Control Arms??

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Hi Marcus,
Frank here. I bought adjustable pro lites upper control arms and your tall stud ball joints for my '65 Corvette when I did my mods over the off season. I am very happy and I like my car even better now. You customer service was the best, made me very comfortable with my purchase. My alignment guy really loved the adjustabilty of of the control arms. Said it was the most accurate alignment he had ever done.
Question: I would like to do my own alignments but with your equipment, how do you measure in relation to the rear wheels? The align shops use "Heads" on all 4 wheels with laser beams to to align in relationship to the rear wheels. How is that done with your gear?