How to cool 4850 crossfire

Hello, I have a HD 4850 video card & Zalman installed on it & soon I will be buying another 4850 video card to go for crossfire as it is supported by my motherboard. But I think that due to the heat pipes getting in the way I cant crossfire with 2 zalman. So I wanted to know if there is any aftermarket cooler that will not come in the way of a crossfire bridge? Thanks for any help.

How to clear the pipes on the top card is the only worry here as it can work in crossfire. My friend ran his 4850 video card above 4870 video card, & guess what there was contact with the pipe but it still fit & worked.