Sending demo reels to production companies

I have a huge library of high quality, but very specialized footage. Although I have a presence in a stock footage site, I thought it would be a good idea to send a demo reel to some production companies. They all probably have a need for my subject material once in a while.

This Forum has made it clear that sending demo reels seeking employment without a phone call first is a waste of time and money. Is it the general opinion that the same would apply to a reel offering a service?

Finally, is there an online site listing production companies and staff (like the artistic director or DP) by name?