Custom Error Pages


I'm wanting to go beyond the included 404 page and create a set of the most commonly seen error pages for our store. When creating a new location on the blocks page, what should I set the dispatch to? I see for 404 it's set to custom - 'no_page'

I would like to make the following error pages

401 - Authorization Required

400 - Bad request

403 - Forbidden

404 - Not Found

410 - Gone

500 - Internal Server Error

Are there preset dispatch codes for any of these please?