What size/type bolts do I need for a new body mount kit?

[ShowroomShine]

If I get a new body mount kit, what size bolts/nuts do I need to replace the factory hardware.

Also, what size torx driver are the seat belt and roll cage nuts?

 

[CJ]

A bump for a new member...

 

[Torxhead]

A good body mount kit should have the bolts. Bolts are measured by the diameter, threads per inch, and length. Here is a basic video:
Instructional Video on How to Measure Bolts: Length & Diameter

I would suggest a stainless steel bolt for a heavy rust area.