ok so i order some sparcos to replace my corbeaus. and i ran into a problem. the seat base of the sparco, where youre suppose to bolt the seat belt buckle into, isnt a direct screw in. its just a blank hole. i was thinking of running out and just getting a nut for it but i dont know the bolt size. any help or suggestion? if i do get a nut for it, anyone know the bolt size for the seat belt buckle?

 

I just took my bolt to Ace hardware and matched one up. Long time ago and don't remember the size. Probably M8x1.25

 

If you don't know the size of the existing bolt, then just get a new nut and new bolt that match each other. If you have the bolt handy, take it with you to the store to find a matching nut.