I got mine from fensport and its the same one for all revisions.

You just have to block of the biggest hole for rev's 3+.

I turned up a aluminium bung at work that is a nice fit and secured it with a jubilee clip.

I'm unsure of the part number it was on the bag that pipe came in

(now in bin) if you contact fensport i'm sure you could find out.

They were the only place which i found that sold this pipe seperate.

Cost

£115ish including vat and delivery if i remember right.
