What Steve said, regarding the split lines;
dunno if it's any help to you as it seems that you want to order them directly. I ordered my Spieglers from a bike shop. They just noted the bike ('76 550F). I gave them one of my old lines as a pattern, just in case, and they ordered the correct lines.
I still have the original package, but I won't be in the workshop until next weekend. I'll take a look for specs if there are any.
Cheers, Remi