Currently looking for one myself !

How can you advertise overclock ready if you don't even have heatsinks on the VRM. 

It's like it's designed to break or something

I am also looking  for this heatsink.

There's actually two vrm heatsinks available, one to the left of the cpu cooler block, and a smaller one on top. The part number and physical appearance has changed from the R9, I don't know it, but if you chat Dell sales they would give it to you.

Here is an example. In theory you should be able to replace with a longer machine screw and slap a washer and nut behind the mobo, but that would require removing the mobo.

Dunno, but with the oem z370 board (i.e., aurora 7, 8 & 9) the top vrm area has the mounting holes but it doesn't include the threading.  There's a separate threaded nut adapter that's imcluded with the board for the left vrm heatsink, but not the top.  Not sure if that's the same for thr 8930.

did anyone ever get the part number? was it easy to install or did you have to remove the mobo?

J46J2 is what was used on R5 R6 R7 R8

https://www.ebay.com/c/4016297157

J46J2

J46J2 No idea where you get it from however

tried these and they don't fit. they are too short. 

Im looking for these heatsinks also. Any update on part numbers?