Thinking of buying these  

I've seen them before
Not sure what they are... But worth 20, imo.

weren't those available...
weren't those available through Ikea at one point?

Possible
Certainly could be IKEA circa 2000.... Seems to ring a bell.

3 Questions
Okay, I'll play the critical voice.
Do you want to buy them ? For me, that means a yes to at least one of the following questions:
1) Do you need some extra chairs ? I mean, do you know where/ whatfor you will be using these chairs ?
2) If that's no, nevermind. Do you love these ? If you don't particularly need them, but fell in love with them, you should buy them anyway. (You don't seem to be to attached, as you don't particularly like the frame)
3) Do you want to make a profit reselling them ? (Do you think it'll work/ are prepared for the bother of selling ?)
If you have one "yes" or more, buy them ! If it's "not really" to all the above, it's probably not such a great idea to purchase them. They'll just sit somewhere around the house and be in your way.
Just my 2 cents..

maybe VKG.......
They very much have the disguised appearance of my birch van kepple and green chairs.
That webbing style was not used by VKG, but i bet they could be.
Too bad they aren't in the bay area or i would buy them since i need one to complete a set.

What do you men a disguised...
What do you men a disguised appearance? DO you have a photo?
I have started a twitter for good deals on Austin's Craigslist. I have passed up too many good deals that I have been sharing with friends and a deal like this I'll even buy and give away to a friend. I was thinking about buying these for a friend who only has space for a two seater dining set in their small house. Do these look dining height to you?

you know wearing a mask of some sort...........
the green ones are mine that i want to have done like this one in proper VKG webbing.

Mario, your chair is pretty...
Mario, your chair is pretty nice as it is and probably all original.
I can't understand why you would have it redone in webbing.
They are not even the same type of chair if you look closely. It would probably just look strange if you tried to apply webbing to your chair. If you're tired of the color, just change the color. Nice chair!

You can probably find these...
You can probably find these in the Ikea catalog from the late 90's, early 2000. Nice little Risom style knockoffs for the price I guess.

.
The ancestors, Mies had these made for himself after he left his wife, I think. Sorry for the poor image, scanner broken.