I'm not proud, but in order to reach the nut on the old one on my '90 525i, I had to bend the line a bit to reach it by pulling it into the car so I could reach it. I screwed the new one in, and pushed it all back into place, and everything is fine. I don't like to bend stuff, etc, but this time I don't thing there was any other secret trick.
Hope this helps,
vince
Naperville, IL
'90 525im
'90 750iL
'92 525iTm
'94 525iT