I did exactly the same last year, and used this site to buy a replacement http://www.buyspares.co.uk/search.pl?query=HCF5176W&x=31&y=12
The model number should be on a sticker somewhere on the outside of the fridge freezer, and I found having a picture to compare with the broken drawer helped to get the right part. Hope this helps :)
Meme, July 2011