Chevrolet: 1957 chevy, chevy sedan delivery, chevrolet model

Question
I have the opertunity to buy a supposidly rare 1957 chevy sedan delivery.  This '57 wagon type chevy from what I can tell from looking at classicbowtie.com/1955-1957 Chevrolet Model Identification.htm , this car is exactly like the '57 sedan delivery except this one has windows all the way around. Ther is no mistaking that this is not a nomad.  What I was told is that this car was manufactured specially for the forest service and that only about 150 were made. What my questian is of course is: Do you know anything about this car and \ or do you know where I can get any info on this. I have tried searching the web but get nowhere because I dont know what to call the dang thing.
 I hope you can help but hey if you cant, well I tried. Thank you for taking the time to read this.
          James  

Answer
I just went to that site and all I could see was the orange 57 wagon for 19,500.00 is that the car . if yes dont forget you are going to buy some ones work and I have found that to be bad luck as you will not know any of what was done or what it has etc. do you get what I'am talking about ?
bigw45