cooler for HP ProLiant DL385 G1

Hello,
I've HP ProLiant DL385 G1 with one cpu.

I want add a second CPU.
The HP kit (cpu+cooler) seem out of stock

I can purchase an opteron 265 from AMD, but I also want a cooler compatible
with HP ProLiant DL385 G1 case and motherboard.

Do you known if cooler need to be HP specific, or if I can just purchase a
socket 940 cooler ? and do you have a suggestion for a cooler ?

I found way to buy an HP cooler

http://forums11.itrc.hp.com/service/...readId=1135580

and more

http://forums11.itrc.hp.com/service/...readId=1195337