Not sure what the deal is with US models vs ROW (rest of world) but I thought I'd contribute some pics, as I read all pages thus far, and whilst the thread has some history, it's not applicable to the Aussie marketů. or so I found out.
I have a 2000 MS4. That's right. built oct 2000. It has a fuel tank with internal pump, filter both held in by spring c clamps which are welded to the tank bottom. The outlets at the bottom are both straight (fuel delivery and return) and bent (vent pipes) The hinge is quite short and close to the base of the tank at the rear. much closer than others I have seen.
It appears from the information supplied in previous posts, that this tank is indeed identical to the US models 2001-2002 MS4 and possibly other later F.I. models.
The interest in this issue sparked because of some dents in my tank, so I started to look for a new / used one in good condition. Pretty expensive buggers these tanks! Not easy to find either...
Anyway, someone asked for pics, so I'll try and upload them, but if unsuccessful I'll link them.