If you want to find classic auto insurance you may need to look at directories such as the open directory project where listings have been approved by an editor. A few years ago using such a link collection daily was normal but they are now neglected because of success of the big search engines.
When looking for classic auto insurance web sites remember there are several searchable sources of information you could think of using besides the methods you already use. There would be things like blogs (of course), and things like web 2 social bookmarking sites.
Suggestions please
While you are using a search engine instead of normal results, check the latest and newest ones. Using an engine with advanced search by date when searching for classic auto insurance should allow you to see all the freshest results, not the highest ranked ones. Most of the popular search engines provide 'similar' options in advanced search for access to other related web pages which you can check out.
When a search engine has a classic auto insurance page listed and you can't get to the site: this could be for many reasons. In situations like this, select 'cached' from the listings so you can see the site in the form it was before it went down.
In a search engine, when trying to look for classic auto insurance improve the end results by thinking up a search phrase (nstead of a single word or a few words) and using double quotes around it. Far better listings will be found because you have enforced more precision.
For more on Finding Insurance, go here.