The Wintec Wide gullets are actually 2XW, 3XW and 4XW, chaps. Don't ask me which colour's which cos I can't remember :)
The old version of Wintec Wide starts at Wide (red) and can use XW (white) and the 3 purple ones and the New version starts at a pink colour which is actually the same width as the XW (white) old version.
I had the old and New version of the Wintec Wides. The New one is far better and fits my haflingers brilliants (wide, low withered and barrel shaped). I use the extra wide (white) on my Mare and the 2xw on the filly.
Not a great photo, but here's my New version on the filly