I have uploaded the source code for the two rules that I have written. The source code is in VB.NET and quite self explanatory. Though some of the IL Library calls may not make too much sense, dont blame me, that is in the FxCop SDK and are not documented.
If you use them you are on your own and your code can break if MS changes those library. There is a high chance that these will change as the libraries are already marked as obselete.