Here are some more slightly detailed or a bit more accurate helmets from/for the mods below to address the gaps from my part one. Some of the included helmets in the skin packs/mods were plain standard Kunos versions. All are made with reference to what I could find from various images on the internet. Not 100% accurate but then most helmets changed almost race to race.
The helmets are for:
Harald Ertl - Alternative from version supplied in F1C75
Hans Stuck - Alternative from version supplied in Lotus 79 skinpack
Arturo Merzario
Chris Amon
Dave Morgan
Renzo Zorzi
Rolf Stommelen
Henri Pescorolo
Roelof Wunderink
used in the following mods:
Lotus 72D Formula One 1975 skin pack
By clemenskaa
Available here: https://www.racedepartment.com/downloads/lotus-72d-formula-one-1975-skin-pack-22-cars.21137/
1979 Complete Season Skinpack - RSS Formula 79 - 4K
By thejqka
Available here: https://www.racedepartment.com/downloads/1979-complete-season-skinpack-rss-formula-79-4k.48224/
Formula One 1975
By Bazza
Available here: https://thracing.de/formula-one-1975/
The helmets are for:
Harald Ertl - Alternative from version supplied in F1C75
Hans Stuck - Alternative from version supplied in Lotus 79 skinpack
Arturo Merzario
Chris Amon
Dave Morgan
Renzo Zorzi
Rolf Stommelen
Henri Pescorolo
Roelof Wunderink
used in the following mods:
Lotus 72D Formula One 1975 skin pack
By clemenskaa
Available here: https://www.racedepartment.com/downloads/lotus-72d-formula-one-1975-skin-pack-22-cars.21137/
1979 Complete Season Skinpack - RSS Formula 79 - 4K
By thejqka
Available here: https://www.racedepartment.com/downloads/1979-complete-season-skinpack-rss-formula-79-4k.48224/
Formula One 1975
By Bazza
Available here: https://thracing.de/formula-one-1975/