My daughter's pano roof needs to be lubricated.
I have the MB service sheet that shows where to lube it.
I have the 001 989 14 51 rail grease specified but one area calls for A001 989 50 51("Special sliding roof sliding compound"), "Drip one drop lubricant each into guide rail at points marked with arrow".
I've attached an image showing the points.
Does anyone know what this lubricant is?
Is there an alternate I could use here?

Thanks, Dan

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2012 E350 Bluetech