It is a rather straightforward interface once you get the hang of it but daunting at first. Aluminum Electrolytic is the category you want. You can initially ignore a lot of the criteria and only select the primary ones. Select 10uf, Axial lead, then select both 400v, and 450v by holding down the "control" key while clicking on the options. 450 volt is more of a standard value than 400 volt. Then click on "Apply Filters" and you should get a manageable list. If you want then to further narrow it down by tolerance, size or temperature you can apply those filters.
http://www.mouser.com/Passive-Compon...yzskniZ1z0z819