u/Extension_Elk7050

Hi guys, many of you may have seen my recent post regarding a nice red 225 bam. It seems perfect however it is not and so I am coming here for some assistance.
i need help locating a brake servo pipe that my mechanic has said has split. The part number is 8L6612041G, and he’s told me my best bet is to replace/retrofit an after marker silicone hose in? Does anybody 1) know where the pipe is in the engine bay (and a detailed description would be amazing) 2) know what aftermarket pipe to go for?

thanks a bunch guys for the advice if possible!