No, you don't want those
free lenses, especially when you need to buy that adaptor... why don't you send them to me, I'll even pay the postage, save you the money and the hassle...
There's two routes with the adapter - the real Pentax is the best, you only need one, like cpopham says. The other kind is sold under a variety of names, I have the Bower version. These come with a tool to insert/remove the adapter, and
importantly do not have a flange. The adapter should be entirely within the K mount. These work fine as well, though in time there will be some problems - it comes off with the lens, or bayonets too far and you get scared you just ruined your camera
Any adapter with a flange is no good, as you won't get infinity focus.
You then simply screw in the lens, the camera becomes essentially a Spotmatic .
Nice lenses by the way, every one is excellent - the 105 will fetch more than the other two, due to rarity, if you ever sell.