Seats: what are you using?

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I'm getting close to being able to put floors in my panel truck. Figured it would be good to know what seats I am going to use before I get to that point. My panel truck came with only one front seat. I was told the original owner ordered it that way. I would like to use two factory seats but I'm most likely going to add a back seat as well. I'm having a hard time finding single seats. So what are you all using for seats?