I've updated all the helmets for this year, thanks to DaiMon & Grl48.
The weird thing is that the Lotus Renaults (BAR's place) and Team Lotus cars (ex-Minardi's) have kept with their original helmets (Villeneuve, Panis, Alonso & Yoong).
Since we're on the topic, I loaded the Pirelli tyres (wadupdater) but the michelin_tread_0 (when the tyres aren't rolling) shows the original tread (i.e. in the pits or braking).
When the Michelins are rolling they show the slicks. Any idea?
There is a folder in your gp4 main folder called "cars" - you need to copy the helmets for both Lotus (original gp4 slot - bar) drivers and the 2nd driver from the team lotus (again original gp4 slot minardi) into that folder - then you should see them in game!