I only like to drive H pattern gearbox cars. I have heard on your forum that no single seater cars have a H pattern gearbox, and it made me wonder how many cars do. Does anyone know for sure, because it would be nice if all of the new road cars were compatible with my shifter.

You can use H-shifter with any type of gearbox. Of course it will be a bit strange in some cases, like motorcycles or modern F1.

Of the official cars: I counted 12.
All the roadcars, the two roadsters, two of the GTR.

Of the mod cars:
Maybe 50%, there are too many to count.
It shows transmission type if you click on the pictures at https://www.lfs.net/files/vehmods

Single seaters with H-pattern:
https://www.lfs.net/files/vehmods/CFB38F
https://www.lfs.net/files/vehmods/2CFDA1
https://www.lfs.net/files/vehmods/18CF01
https://www.lfs.net/files/vehmods/6786C3
I might have missed some.

Thank you Gutholz, it's good to know such things before I buy. It seems like "quite a few" sums it up.

There are 277 modded cars with H-Pattern gearbox.
VerbatimZ made a website using the LFS Mods API, allowing users to filter cars by geartype, drivetype, class, tweak etc.

https://www.lfs.net/forum/thread/97488-LFS-vehicle-mods-app-with-search,-filter-and-sort-

Thanks kristofferandersen, as you may see, I bought the game.