All the best
I looked for a long time when making the Amplifone HV boards, they are the same
Found the original supplier, but they didn't reply to emails, so I used an alternative, that did the trick
I imagine you should be able to find one, I was looking for 100
Heh. These are the same heatsinks used on the V2000, so if you (or someone else) needs another, you could probably harvest one from a V2000 parts board. B&W stuff seems to be much more common than 6100.