Seat tracks help needed

I was thinking it might help make what needs to be done clearer. Did you not get the hardware with the seats when you picked them?
Nope, no hardware came with the seats and I’ve looked online for the hardware but don’t see any type of bolt that would work. I’ll prolly just drill out the threaded hole on the back bottom of the seat and capture the hex bolt with a nut. Appreciate the suggestion tho.
There are differences at times, so always good to mention the year of the car & or seats.
1969 tracks as one example have one stud that goes into the seat frame & receives a nut at the front & a regular hex head bolt at the back.
I get how it looks like it should be done but because of the square head and square hole on the track it needs to be threaded into the seat bottom. Kinda getting frustrated here. Sure would like to see a picture as to finished product.