Bumping this thread, posting up some tracks for the F1 75 season, that ran in 1975.
2.1 Race 1: Argentina Buenos Aires:
AMS conversion, fairly poor but servicable
http://simracerspics.com/index.php?resources/buenos-aires-1979.387/2.2 Race 2: Brazil Interlagos
Another AMS conversion, ok but may need a high res mesh
http://simracerspics.com/index.php?resources/interlagos-1975.511/2.3 Race 3: South Africa Kyalami
Terrible quality, but hey it's there
http://bitigee.com/17259429/75-kyalami2.4 Race 4: Spain Montjuic
Haven't tried this one, but it's there. Rainmaker conversion, so don't expect much
mediafire.com file/yb0j22wb2h06nnl/Montjuich+1975+v1.56.7z
2.5 Race 5: Monaco
1988 Early convert (I think the 88 is closer than the 66, as they had armco and the swimming pool in 75)
mediafire.com download/ncvode1cbi618sy/Monaco+1988+v1.0+by+SBB+project.7z
2.6 Race 6: Belgium Zolder (Sorry Spa lovers!)
GPL convert, but not too bad
https://www.racedepartment.com/downloads/zolder-1967-v-2.18383/2.7 Race 7: Sweden Anderstorp
Modern Version, but layout hasn't changed much
https://drive.google.com/file/d/0BwrXnFswp6WJWkxXalI0N2Uzazg/view2.8 Race 8: the Netherlands Zandvoort
Tough choice, as the Kunos layout isn't the right one. There is a payware 1966 layout that is close.
https://www.f3classictracks.com/sandevoerde2.9 Race 9: France Paul Ricard
Another 1988 convert, same story as the rest
http://adf.ly/246619/http://www.mediafire.com/download/3t5itnnqybpa2is/Paul+Ricard+1988+v1.2+by+SBB+project.7z2.10 Race 10: Great Britain Silverstone
1988 Has the wrong chicane, Kunos's 1966 has none. I'd go with the Kunos version personally
mediafire.com download/cco96jedt81e6ca/Silverstone+1988+v0.91+by+SBB+project.7z
2.11 Race 11: West Germany Nurburgring (Nords)
Kunos's one doesn't have a proper pit lane, there is a rainmaker one, but ehhhh.... Maybe a N24 layout?
mediafire.com/file/3yzvmm2f1xfhkl9/ns65.7z
2.12 Race 12: Austria Österreichring
Another OK conversion
mediafire.com/file/ckbd6o2smra2ksc/oesterreichring1979.rar
2.13 Race 13: Italy
Kunos one is the closest I know of.
2.14 Race 14: United States: Watkins glen
Lilski Modern Scratch Built (Classic Boot Layout). There are classic ones, but Lilski's are too good to ignore.
https://www.racedepartment.com/downloads/watkins-glen-international.20204/Tough Choices, I can help repair walls, fix any missing track limits, add a high-res mesh etc etc if needed. Good luck