I just did this and, to make your life MUCH easier, buy 5/16" fuel line for the lines that are labeled 8mm, and 1/4" line for the 6mm lines. A lot of guys on here say to put 1/4 on both, but that makes the fuel line the bottle neck in the system, and also makes it a complete PITA to put them on the 8mm fittings (and possibly breaking the plastic ones).
If your'e going to replace the little hoses, I would think you might be able to get by using tiny wire ties to hold them on. Someone else should give a second opinion on that.