Delta Cup Arm End for 10/8 Carbon Fiber tube

I want a very large format Delta Printer. I would like to purchase the Seemecnc Printer but @$4000+ it's out of reach. With tons of parts in stock including Linear Rails from a retired Kossel Build, I decided that I could afford (and it would be more fun) to build a large delta printer of my own. With two Seemecnc printers, it would be advantageous to use interoperable parts where possible. Pictured I reverse engineered delta ball ends, the ball ends are connected to 500mm 10od 8id carb