ok as i promised here it is.
The dementions are 20"x51".
The peice I had was 3'x4' so I cut it down to 48"x20" and then used the scrap for the remaining 3 inches.
The feet in front are 3 3/8". The rear are 4 5/8". I made the mistake of not checking that it fit before I did the carpeting. Well it didnt fit and so I had to cut one of the legs short because it was sitting on the center hump. I wouldnt have had this problem if I made it out of one peice that was 52"x20".
I sprayed a litght layer of aresol glue on it then used staples to get the fabric tight and smooth.