Thanks for your responses. However, I am not talking about crossovers. I am wondering what pieces you need to make Parallel track. For example, for a #5 turnout it says I need one piece of 4.5" straight, two pieces of 1.75" straight and a half curve O72 added on to the curve section of the switch to get to Parallel. I'm wondering what I need for the O72 switch to get to parallel.