This kit replaces all of the grade 8.8 bolts with grade 12.9 socket cap bolts. The additional clamping load, and bolt sleeves will help provide a bit more rigidity to the bottom end of your LF3/4. Fitment has not been confirmed with other RWD LFx applications.
Zinc plated fasteners are used where possible to avoid corrosion. M8 bolts should be torqued to 25ft lbs. M6 bolts should be torqued to 12ft lbs.