you want to buy the bolts from either nissan, coz, or an automotvie store that sell automotive grade bolts. Automotive bolts have different(stronger) grades strengths than hardware bolts. So a bolt from home depot reading grade 8, and a bolt from your car reading grade 8 are not equal in strength. Auto bolts are much stronger. So especially on a drive shaft, you don't want bolts from a hardware store.