crpietschmann there is a mix of icons available at the site. Some as large if not larger than what you are looking for and in the .ico format. Look around a bit more you might find what you need. Excellent site.

It seems to me that having to use the meta tag specifying browser version was a huge pain in the arse moving forward. If you specifically want to lock your pages to a particular browser then you can do so w/ the extra meta tag. Without the extra tag the browser assumes hey they want the most recent standards mode and renders to that. I think it is a huge win as only the misinformed web developer will be punished. Ultimately, that obviously means their users are punished but that is a cyclical pain cycle.