(This is an edited repost)
If someone here wants to try to reproduce Cathar's block, one could take a copper HSF, and add barbs and a lid.
From this list , I found the following were of a skived copper finned design:
(of course the fin spacing is WAY off, but it's not too bad)
Global Win CAK II 38 and CAK II 16
Dynatron DY1206BH-638
CoolerMaster HSC-V62
Dynatron DC1206BM-R
(I shortened this list even further, to include skived copper heatsinks, without a central hole for the mounting bracket)