Ball Joint Splitter - Which one?

[scz4]

I am replacing the wishbones on my M3 Evo this week whilst fitting coilover and I am thinking ahead and going to get a ball joint splitter to help separate it from the subframe as I hear this can be a real pain.

Which tool do I need?

http://www.halfords.com/webapp/wcs/stores/servlet/...

Edited by scz4 on Monday 23 February 11:51