Funny you ask. I just found a bench seat for my 46. I don't know what it came out of though as I found it with a bunch of other seats in a cargo trailer at my local junk yard. It measures right at 45" which is a perfect fit for our trucks. the best I can guess is that it came out of some minivan.
Here is a pic of the 2 seats I have. the one without the head rests is what was in my truck when I bought it. It was a little to large at 51" as it kind of rubbed the doors. The one with the head rests is the one I just bought.
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