Modify the attached family to create two new desks: 39"x148" and 39"x76". This will be used in Revit 2011 and the resulting file must be compatible.
here is the cropped family file.
2 freelanceria on tarjonnut keskimäärin 210 $ tähän työhön
I can provide the requirements that you want for your revit family. I will create the two sizes in a parametric family like in the sample that you sent.