66 Econ Middle bench seat mounting bolts

I have a "new to me" middle bench seat for my 66 econ with 3 mounting clips. Can someone explain what type of bolt or such is used to mount this to the plates in the floor? Pictures would be great and a name of such type bolt. I am assuming it is like a T, where you put the T upside down into the floor plate, turn it 90 degrees, then the mounting clip, then a nut?

Thanks, SRJ

Here is an exploded drawing showing all the seat parts.
https://econoline.org/drawing.php?d=P-4034

The T-shaped bolt you seek is part number 374914-S. Scroll to the bottom of the previous drawing to see a table of all of the part numbers for that drawing.
Click on 374914-S and it takes you to the following page where you will see the size and description "1/2"-20, 1-1/8" long, T-head bolt." I hope to have individual part drawings and photos on that page someday.
https://econoline.org/part.php?id=8927

,,,,or maybe grind some flats on a carriage bolt?

Barnabas wrote:The T-shaped bolt you seek is part number 374914-S.  Scroll to the bottom of the previous drawing to see a table of all of the part numbers for that drawing.
Click on 374914-S and it takes you to the following page where you will see the size and description "1/2"-20, 1-1/8" long, T-head bolt." I hope to have individual part drawings and photos on that page someday.
https://econoline.org/part.php?id=8927

Awesome. Just what I needed. Thanks!