I have an 86 c20 suburban that did not come factory with the third seat. However, I have a lot of friends and need to have the extra seating. Can anyone lead me the correct direction on how to add a third seat? It doesn't appear to have any kind of place for one to bolt on. I have been trying to search it, but most results only show newer vehicles. I did see a plate/bracket weld in object, but can't find a place to buy them or anything. So, any help would be much appreciated. Thanks in advance.

-Blane