Yeh ive got one like that aswell. Its from an mondeo tho and probably slightly smaller. I used to use it when i watercooled my 400 celeron!
The astras are relly good but are slightly too big to fit in most cases the traditional way. Never the less they are the best i have found in the uk (and have been looking for a year or more!).
Would be great to see what a nova one is like tho