I am getting ready to mount new seats in my Studebaker. These are seats from a Chrysler Sebring convertible that have integral 3 point belts. The mounting needs to be able to stand up to g-forces associated with seat belt anchoring. My floor is re-enforced and plenty strong to bolt the seats. Next question is what grade bolts to use. Is grade 5 adequate or should I spring for the grade 8s?

Most of the bolts will be clamping force, but a couple will have side stress.

thanks

Pat