Just to add a couple things, in some of these modifications, you may need to edit the product .xml so it will import/be compatible with vBulletin 4. To do this, open the product .xml and find:
Code:
<dependency dependencytype="vbulletin" minversion="x.x.x" maxversion="y.y.y" />
And change that to:
Code:
<dependency dependencytype="vbulletin" minversion="x.x.x" maxversion="" />
Also, the fixes for a few of these to work in vBulletin 4 are posted within the modification thread. Remember, search is your friend