Bolt Questions

[Kantosensei]

Happy fathers day to all the fathers! My brother-in-law and family are coming to visit me on Thursday. No its not a bad thing as he is my good brother-in-law and I have known him longer than my wife. AS most of you know I live in Japan and only have access to metric bolts and he has agreed to go the one of the major hardware stores in Colorado Springs to pick up a few things for me.
1. I need to know what size and length of carriage bolts that hold the body to the frame, as I have new body mounts and the rears are bent, and the radiators are rusted.
2. What size bolts hold the double wall top to the bedside.
3. What size bolts or screws??? hold the arm supports to the rear hatch and double wall top.
4. What size are the carriage bolts that hold the front bumper on.
This info would be greatly appreciated, as I don't get many visitors and its a pain to get things shipped.