Hi Chan,
IMT is the place to look for. But why are you looking at a old release of DFM like 4.0 ? The current FCS version is 5.0 and GA of 5.0.1 is expected soon, also current GA version of 4.0.2 is also availabe. You should stick to the latest or GA release.
BTW, 4.0 is supported on Windows 2008 R2, but not on ESX 4.1 but only till 4.0. where as OnCommand 5.0 is supported on the versions you are looking for.
Below is the link to the IMT site.
http://support.netapp.com/matrix/enduser/displayResults.do?storageSolution=276&narrowTree=true
Regards
adai