Help needed with 1984 Williams decals

I've made good progress in creating a genuine race-by-race carset for 1984, with almost four teams finished; I'll upload them ASAP rather than disappearing for a year to complete the entire season. But I have gotten completely stymied by two late-season Williams decals on Laffite's cars (from Austria and Zandvoort) and Rosberg's non-tobacco helmet (from Germany and the European GP). If anyone can identify the logos circled in the attached photos it would be much appreciated.

Photo 1: https://i.servimg.com/u/f39/19/33/76/82/fsfafa10.png
Photo 2: https://i.servimg.com/u/f39/19/33/76/82/captur10.png
Photo 3: https://i.servimg.com/u/f39/19/33/76/82/keke_r10.jpg

Thanks very much for the quick response! This definitely solved the Rosberg helmet problem--I did study his uniforms but just didn't see the resemblance of the Scholler ice cream logo to his nontobacco helmet. (It turns out Rosberg drove a Porsche 956 in 1984 with Scholler all over it.) Laffite's Austrian livery I'm still not sure about; I concluded that it's "Stiz" Sport b/c the Italian cyclist Fausto Stiz did start some sort of sporting apparel/goods company in 1981. But there's no logo like the one pictured anywhere, so I made it. Does the attached image seem likely?

I finallly got the decal for Zandvoort thanks to a very high-resolution photo at https://www.motorsportimages.com/photos/?race_type_id=&search=williams+zandvoort+1984 I realized it's simply another iteration of the Bonaparte logo that appeared on the Williams at Zandvoort in 1983.

You're welcome!

If you need help for the track sponsors Edge has made a lot of them for 1984!