Originally posted by davef Think about that for a minute.... a hot shoe is a standard mount that allows any compatible flash to be mounted. I'd be surprised if a generic cover didn't fit. It may not look like the OEM one, but it should fit unless there is a very strange prism shape. Dave
The question is, how well does it fit. Hot shoes do vary, albeit only slightly. Just tried my K-7 shoe cover in my wife's Canon Rebel-class camera, and the Canon shoe is easily a couple of millimeters longer than the cover, and doesn't seat it as tightly as it does in the K-7 either.
Given that Pentax states in the user manuals of weather-sealed cameras that the hot shoe isn't weather-sealed without the cover installed <EDIT: Ignore this, I was misremembering, and talking complete nonsense. Sorry!> , I wouldn't chance using a third-party one that might be a touch looser and allow ingress of water more easily.
Obviously for non-sealed cameras like the K-x, this isn't a problem.