I'm not a big bolt guy, yet, but I have not heard of anyone making them. I would think this is a good oportunity to do some measuring and get you some of the different lengths from the parts houses that will add up to what you want. If you have a lot to run I suggest buying a roll of it and some fittinds and make your own. Be sure to have a good flaring tool to do the double flares and save yourself a lot of money.....Good luck and I'll be watching to see if anyone has a source for Big Bolt pre-made lines.