Finding and replacing high authority 404 pages

[regp]

Here is an old trick. Just go to google type 'Service No Longer Available+ your niche name'. You will find tons of these pages. Then study their page merits by using any tools such as opensiteexplorer or ahrefs. And then just build content and replace those pages.

I have already tried it its hard to find good pages in that way. But still a good suggestion though thanks.