Coverdesigner and Avery labels

Who can help me with the next problem:

I bought Avery CD labels J8660 (simular to L7660 and J8760 labels) to use in coverdesigner within Nero.
The standard labels which can be selected do not include my type of labels.

Does anybody know where to find some *.dat files which I can import to the software or is the only way to do it by trial and error to manually create the paper stock?