If you where asking how to fabricate a cross-over tie rod for yourself in your own garage, then you might get a little more respect from others regarding your request, but to just ask for somebody to hand over the specs in order to take it to somebody's else's shop is a real "wannabee" Joe Auto Tech move. If you go to a fabrication shop, they are going to want very specific specifications before they will touch the job, and if what they make you is incorrect, they will still want you to pay for it anyway.