No, that's not the part. I'll see if I can find a Bosch for you. It's best to get a good one. There are a lot out there and many will will fine / OK but some on here have suggested getting the Bosch.
Back in a minute.
http://www.ecstuning.com/Mercedes_Benz-2004-SLK320-170.465-Base-Convertible-V6_3.2L/Search/SiteSearch/003_153_28_28/ES2593181/
I found this. Is this one it?