I found that this company has a smaller wrist rest and a full sized one.
grifiti.com (apparently, I can't post links)
Never heard of them or ordered from them, but they did respond to my email question about the dimensions
arn
so I got one and couldn't be happier, here be pics:
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it fits the HHK nicely, wish I had a choc to give you guys a better reference. It feels like an old school wrist rest, but it's slightly fancier than that, it's clearly made of three distinct parts (as you can notice on the second pic) the top cloth, the soft-ish middle and the lower layer which feels less "spongy" than the above. It feels heavier than it looks.
got it on
amazon for little over 10 bucks (including shipping) and got it in just a couple of days.