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Ouch, good luck.... I got mine right before they went out of production, then subsequently out of stock. Set a "saved search" on Ebay so you get emailed when a used (or random NOS) one comes up for sale. You can test it by running the vacuum line for the installed one to the one you buy before going through the hassle of installing it. ALSO, cover the entire cap with PC-7 epoxy so it doesn't pop off. My CL55's vacuum diaphragm was destroyed by the previous owner, so I know your pain lol. If your diaphagm is OK and the new cap went on but isn't working, you may as well sand the red area and apply PC7 around the darker blue area... i did the whole cap (light blue) so I don't have to deal with it again. My reasoning is the replaced cap may not be sealing, plus the clips that hold the top on suck and will get brittle and break over time.
Do be aware, there are two part numbers for each side, one for keyless go and one without. They Keyless go unit will work on non keyless go equipped cars, just an extra pigtail I tied up and ignored.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
