951 rear brake install

I have almost all the parts I need now (I think), and I'm getting reazdy to put it all in after I get parts powdercoated. German cars all use 10mm metric bubble brake lines, right? Can I use Beetle stainless steel flex lines, or do I need to use 951 parts? For the parking brake, can I use the beetle cable tube, or again, do I need a 951 part for that?