I ordered a tube rear bumper on my 4Runner and it's currently being painted. I'm about to remove the stock bumper. The tube bumper did come with any hardware, so I called the the company and asked if this was a mistake and they said that it does not come with any and I'm suppose to use the bolts that are currently being used in the stock bumper. Personally I don't think this is a good idea, because the bolts are so old and rusted. So, I will probably replace them with new stainless steel bolts.
Has anyone done this type of installation before? Any help or suggestions will be greatly appreciated.

Thanks,
Ivan