Thanks,
I got some 5/16" Dayco F.I. hose at Pep-Boyz. 20" length works well.
The original lines are BMW 8 x 13MM which is probably available from the dealer if you ask/email.
..ah..it turns out the seep is coming from the fuel line fitting at the injection rail. I didn't replace the o-ring
on the fuel line when I was doing the crankshaft pos. sensor a few weeks ago. It was two years old but might have been nicked during that repair work.