Any one with a roll cage and no protection is gambling with their life. If your head or any body part can make contact with the cage it needs to be padded correctly. A 15MPH crash that allows your head to contact the cage will change your life forever. Traumatic brain injury is not just a concusion or big headache. It is life altering. If you want to see what can happen to your head there are some You Tube videos of the rally cars that show what kind of gyrations your head will take when they run off the road. One had a female passenger who was the map operator. They only ran into an open field and their heads were like bobble head dolls.
You can't use any of the foam wraps like some of the jeep cages have, or your kids use in the swimming pools. They won't protect you at all. They are just window dressing. There are two styles of padding that are nationally certified. sfi 45.1 Spec Approved and FIA 8857-2001 Type A.
Both Tom and I did an exhausting search for something else and believe me there isn't anything out there. These web sites spell it out.
BSCI Roll Cage Bar Padding / Roll Bar PaddingBSCI Roll Cage Bar Padding / Roll Bar Padding
Orange Aid SFI Approved Roll Cage Padding
There is one combination of the two types of padding. It will cut down on the hardness of the FIA stuff.
There are other sites that will sell you the same material, but these sites are the best and spell it out. Cost are about $60 per 3' stick for the Orange Aid and 3 bars of the other types for the same price..
Also if you plan on racing your car you need a Hans Device. It is the only thing that will keep your neck safe. You cannot control your head with a helmet on with the smallest of impacts. I am sure some of the racers will chime in on this.
I have added the padding to my car. It makes it look a little funky, but you need it. These cars, particularly the GT40s have everything in close proximity, so you need the protection. Both the SFI and theFIA come with an adhesive on the part that contacts the roll bars. It isn't enough to hold it though. So some other method of holding it has to be used. I used large Zip Ties. You have to have something that will keep it stable with heat and vibration. I will have to redo some of the ties in mine as I meant to see how it looked and then remove the tape guard. I fogot and finished the project.The ties can be rotated aropund behind the cage to make it look a little neater.