MOSS Filter web parts Not found

To add filter web part to your web part list:

1. Click on the new button in the web-part gallery and select the correct classes from web part gallery

2. If you can’t find them in web part gallery, upload the Web Part definition files from %CommonProgramFiles%\Microsoft Shared\web server extensions\12\TEMPLATE\FEATURES\BizAppsSiteTemplates\dwp.

For more information about Filter web part Click here