The HANS website has measurements for their devices, you may want to check those against your neck measurements or just go to a place like CSC Racing and try them out.
When I started co-driving:
Peltor helmet + intercom.
Leaf Racewear 2 layer suit (so I don't have to bother with the nomex underwear with a 1 layer and it's accepted in other racing series)
HANS sport series (a bit cheaper than pro, and I personally don't notice the extra weight)
Nomex balaclava
In terms of other co-driver gear:
- Small laptop bag that I used for a co-driver's bag, it had lots of pockets for pens, pencils, etc
- 2 wrist watches, just in case 1 fails
![Tongue Tongue](/forum/yabbfiles/Templates/Forum/default/tongue.gif)
- Staedler (?) 2 mm mechanical pencil + soft/dark leads. I wish I had discovered this sooner, it makes writing notes during recce a MILLION times easier than traditional mechanical pencils. This won't snap on you when you're trying to write notes over bumpy roads.
- Spare batteries for intercom
- Sliding zipper plastic bags, because I sucked as a co-driver and got sick on pretty much every rally.
Plus a bunch of other miscellaneous stuff I'm forgetting. Don't forget to get your first aid course in too for the licence.