Helmet and face error, tex mixed?

Hello,

for some drivers I just found out that there are errors when you look at the driver cam (where you see the helmet from the front).
The helmet is a mixture of helmet tex and face tex (I guess so).

I know where the helmets are saved (cars.wad) but where is saved how the whole helmet for the helmet front cam is made together?
So where could I just swap two helmet+faces to make it easy for me to solve this?

Thank you

Thanks to the great knowledge resources in this forum I solved it:
[www.grandprixgames.org]

Had to copy the files into the folder mentioned there.