Help with identifying a Chevy Truck Bench seat

[AZ59apacheguy]

So I bought this bench seat from a local guy on craigslist to put in my '59 1/2 ton, he sold as being a seat out of a '57 1/2 ton. I took his word on it, bought it, brought it home, tried installing it and what do ya know, it doesn't fit. Both the mounting brackets and physical size were TOO large. Can you guys please help me identify this seat so I can sell it for the right type of truck. I was told it might be for a '60 to '66, can someone confirm that? Thanks
Here are the dimensions:

Front Bracket mounting hole spacing= 50" & 42.5"
Rear Bracket mounting hole spacing= 49" & 44.5"
Bottom seat= 57.5" Long, 22" Deep
Back Rest= 59.5" Long

Here are some pics:
http://i1236.photobucket.com/albums/...y/IMG_1226.jpg
http://i1236.photobucket.com/albums/...y/IMG_1225.jpg
http://i1236.photobucket.com/albums/...y/IMG_1227.jpg
http://i1236.photobucket.com/albums/...y/IMG_1229.jpg
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