http://www.ebay.com/itm/291061117867
http://www.ebay.com/itm/261378539995
I was hoping these were some unicomp variant but no, they're just rubber dome.
I recall some people here talking about re-casing an F-122 and thought this could be a possible solution. Listing says he has a lot of them so he may let a few go dirt cheap.
The internal structure may be different enough for it not to work, but thought I'd post it anyway.
Sadly, in the photo of the keycaps, it shows that these are not buckling spring keycaps. So we totally can't use it at all.
Fohat and Wcass have both posted on how to adapt other Model M122 casings for an F122 board.