A requested helmet, not perfect but it works 
If you don't know how to add helmets to your game go to the link below and watch the tutorial video:http://www.racedepartment.com/downloads/2017-career-helmet-template.16870/
If you don't know how to add helmets to your game go to the link below and watch the tutorial video:http://www.racedepartment.com/downloads/2017-career-helmet-template.16870/
As far as the three files go it would be for example, com_06_helmet_d.tga (this is the career helmet I use).
The video at the following link has a good tutorial on how to do it:
http://www.racedepartment.com/downloads/2017-career-helmet-template.16870/