These nice triple-shots keys come from a Brother typewriter found at a flea market
Sadly although they more or less "fit" as is on an HHKB, they're not really a good fit. They don't line up nicely, most row profiles are wrong, the larger key simply don't fit in, etc.
One of the row kinda fits but... I had to put the keycap upside down (it's a 'Z' so it's not obvious on the picture, but that key is upside down).
Too bad because the "feel" of these keycaps is really amazing and triple-shots are always sweet...
Oh well, at least now I've got a nice "CODE" key which I did put on my Topre "switch tester"
So if I was you I wouldn't even bother with the keys from the Brother AX-20 / AX-26: contrarily to what has been written here they don't really fit Topre boards
