This is all I want to know, have been waiting since Friday just to hear a yes/no.  This is going to be critical info so I hope we can find out today.
[/quote]

Looking at the photo and assuming the board is exactly 10cm X 10cm
and assuming that the chips are mounted the same distance apart left to right as front to back,
a heat sink that is 2.5cm by 2.5cm with a hole drilled in the middle should cover all four chips.

Worst case you get a heat sink that is 2.5cm x  X long and cut your own to length.