There is a long and a short, but possible 2 equal length lines if its an aftermarket. You want them far enough from the header not to allow them to heat it, you ARE trying to cool (to an extent). Bend and wire tie or support so they dont touch header. You dont want them bouncing off the header or anything esle and abrade a hole in them. Hot pressurized trans fluid spraying on a hot header is no good. If you got 2 equal lengths, run the front nipple to the pass side rad spud, it doesnt matter which way the fluid circulates in the bottom of the trans.