No, Digi-Key only has thermal pads, and I got some, but I need the ring that isolates the screws electrically from the heatsinks.
:shrug:
Oh well, it's not a big deal, but it would be nice. I was hoping for some additional safety, because the heatsinks are large (easy to slip up with a screwdriver):
(Max heatload would be 6.4 Watts)