If it makes you more comfortable to spend for imported metric fuel
hose, that's OK. I just went to AutoZone and bought enough high pressure
Fuel & Emissions SAE 30R7 5/16" (7.9M) dia. hose @ $1.00 per foot to
replace everything.
I'd say that you're pretty lucky to have gotten 32000 miles out of
it. That's the hose that's frequently blamed for fuel leaks in
European cars that are supposed to have 7.5mm fuel lines. It's the
wrong size, and the wrong spec. 30R7 is only rated to 50psi working
pressure. That doesn't give you shit for factor of safety. If you'd
gotten high-pressure EFI hose (SAE 30R9) at AutoZone, you'd notice
that it's actually more expensive than getting it in the proper size
from a BMW dealer. I don't mean to be an ass, but I've seen this
stuff installed on these cars, and even when it doesn't leak, it
deteriorates very quickly. Even if it didn't deteriorate, I hate to
think what would happen if the regulator failed (not unheard of) and
the fuel rail pressure jumped over 50 psi. (In case anyone cares, I
do feel safe using 30R7 in the wrong size for the RETURN line, since
the pressure isn't as great and there aren't any of those push-on
connectors involved.)