Part number needed, fuel return nipple cap

If you saw the thread in the power enhancement forum, you may know what I'm about.

In putting the pp520's in my wife's 2003 Golf the cap that covers the unneeded fuel return nipple on injector #1 picked up a couple of cracks and leaks. Not good.

I have a temporary cap on it, but need something more substantial for the long run. What is the part number for this piece?

Also, what is the part number for the fuel return lines, the braided rubber ones? Figure I could replace those while I was at it.

Thanks,

I have the fuel return line
http://www.metalmanparts.com/displayProductDocument.hg?productId=163&categoryId=37
And the cap.
http://www.metalmanparts.com/displayProductDocument.hg?productId=164&categoryId=37

links didn't work, but found them through the search function of your site.