Seat belt mount position?

I'm finally at the point in which I can take the 67 on it's maiden voyage out of the garage for a ride down the highway. The only thing I have left is to mount the front seat belts ( lap belt only for now). The previous owner replaced the floor pans, but did not mount the belts. What/where is the correct position to bolt the belts to the floor? A picture would be very helpfull.

Thanks

That does help. Thanks!