Hi [NAME] welcome to this free user-to-user Alienware laptop discussion forum.  The laptop computer heat pipe system is a sealed part of the Alienware 17 R5's CPU & GPU heatsink assembly. Search on internet for your Dell Part Number (DP/N). The GPU heat pipe is different for AMD Radeon Graphics DP/N 5G342, Nvidia GTX 1060 DP/N TK0T2, and Nvidia Graphics DP/N Y6MN4. Guess that eBay might provide the CPU & GPU heatsink assembly and YouTube video + Alienware 17 R5 Service Manual will provide disassembly/assembly guidance. The perpetual problem is always what thermal pads to use, so take pictures/measurements and transfer thermal pads would be a good option, if second hand heatsink assembly has no thermal pads.  [IMAGE]Alienware 17 R5, typical thermal pads on heatsink assembly Dell Alienware 17 R5 Heatsinks | Dell Alienware 17 R5 Laptop Parts (parts-people.com) 
I accidently broke a piece of the heat sink off. Does anyone have any suggestions where I could get a replacement?
17 R5, fan heat sink replacement