I am not sure "What sanctioning body rules" the cage was built for but I do know the Los Angeles County Sherrifs don't monkey around or mickey mouse anything. I will check with a LT. I know and see what I can find out. I know by looking at the cage its very well made and extrememly reinforced at all points. I have never seen a cage so nicely built except in pros race cars.
In any case we can always remove the cage and put in a NEW interior with a NEW complete color change and get top dollar for a super low mileage Caprice! But I hate to pull that cage.