A while back I upgraded the CPUs in my 4,1 I had purchased it new with the Dual 2.26 4 cores. As I explained at the time, I was pretty sure I had ruined my tray so I got a new one at DVWarehouse and finished the job. But before I did, just for fun I put the 2.26s in the "dead" tray and to my surprise they worked !! So the "dead" tray has been sitting in a box making fun of me from a shelf. With 5690s now officially a dime a dozen, I decided I wanted to finish that tray. TO do so I needed the 2 Heatsinks, A & B. Talk about sticker shock ! New parts through official channels were pricey ! I managed to find Heatsink "A" on EBay new for $139. I was thrilled but still needed "B". I was going to get one through MacPalace in Burbank but reading some reviews of them it seemed that they frequently do a bait and switch, raising price after you order. Then to my surprise I found a used CPU "B" Heatsink on Ebay from Powerbook Medics for "just" $200. I ordered it and got ready. A few days ago all the parts were in place. I started with A, and after just one additional tightening I had the first CPU done, all 4 RAM slots working. It seemed so easy !!! Then I got to "B". I got the CPU dropped in, I cleaned the old paste off and greased it up with some new paste. As I carefully lowered it down, I realized it wasn't lining up correctly. I couldn't understand what was going wrong, and then I noticed that the "A" Heatsink has a cutout to allow for a smaller metal heatsink that is already on the tray. And oddly, my PowerbookMedics "B" Heatsink also had this cutout. And then I realized that they had sent me the wrong part. I had in fact gotten an "A" heatsink. And it won't fit. It is a true pity that Apple didn't design these to be the same part. I imagine it was to keep the thing aesthetically balanced and pleasing to the eye. In any case, my upgrade was stopped dead in it's tracks. I sent them a message via their website informing them that they had sent wrong part. I also went on Ebay and saw that they had also listed a CPU "A" heatsink. Looking at the photos I realized that the "A" they had in the photo was actually the "B" unit with the flat bottom. And going back to the auction I bought the first "B" from it was clearly an "A" with the little cutout for the tray heatsink in the photo, it also had a little sticker in the photo that was on my unit. So obviously they had just mixed up the listings. So I message them again that I was going to buy the listed "A" unit since they had switched them. I asked that they get a tray out and verify that they had switched the listings and to not ship it until they were sure I would finally get the right part. The next day I awoke to notices that my new purchase had shipped ! No answers to any of my queries. I started firing off messages via their website and through Ebay. Once they shipped the thing it gets much harder for them to realize their mistake. And sure enough, when they finally read my messages, they start claiming that I bought the wrong part. They tell me that they aren't real photos and they only use stock photos. They also claim that they had no record of me buying the first one. At this point I realize that I had used a different Ebay account to buy the 2 items. However, both Ebay accounts go to the same person at the same address and are paid via the same exact Paypal account. I can not for the life of me understand how they can't connect the dots. Has anyone else had dealings with these guys? The messages I get from them are completely clueless. I have sent photos and explanations and they just will NOT pay the least bit of attention or admit they made a mistake. Today I was forced to file a claim against them. I HATE filing claims as I know as a seller that the very first thing Ebay does is lock the money up to get your attention. As a seller, this stinks, especially when the buyer got wrong item. But in this instance I knew exactly what I wanted and was sent the wrong item. Had they read their support email in a timely manner they could have verified that BEFORE shipping the 2nd one. Aldso, now I am worried that the 2nd one will really be an "A" as it is listed, even though the picture shows a "B". And I find it very insulting that they have fallen back on the "Oh, the picture doesn't matter, those are stock photos" when the picture clearly shows the exact WRONG unit I got. Right down to the secondary part number. (Which can be googled and found associated with an "A" heatsink) We occasionally make mistakes. We have sent people a 3GB version when they ordered a 6GB GTX780. We have had cards die between testing here and install at the customer's end. But we own up to these mistakes and do what we can to fix it. Now I have no idea what is coming in the mail. When people say that doing a 2009 CPU upgrade is a pain....it's true !