Try Door Bolt Keeper Plate
Google Images will show you several
A good old fashioned hardware store may have them
Or a specialist door furniture shop
One gets supplied with a door Mortice Bolt
http://www.amazon.co.uk/Ironmongery-World-Window-Security-Mortice/dp/B00DDUPVBM/ref=sr_1_5?ie=UTF8&qid=1421532876&sr=8-5&keywords=window+dead+bolt
Good luck...
January 2015