Size of bolt 08126-8202H for S13
 

This would be the 2 bolts that bolt the seat belt buckles onto the bottom in the rear and to the side on the wheel well. Where can I find an eye bolt equivalent..?

Pretty sure all bolts used for the seatbelt are a universal between all cars. 7/8th 20. All eye bolts are this size for bolt in harnesses.

http://www.saferacer.com/racequip-sh...rrcxoCSHDw_wcB