I'm all for finding cheaper parts instead of spending a bundle on brand names in many, many cases....however, I think this might be pushing it a little, those look pretty horrible.
I also don't have a problem with people running coilovers on their daily drivers, I'm working on getting a set for my girlfriends daily, and considering getting another set for my other car (for clearance reasons)
So I won't bash you, but I can't reply without bashing those particular ones just a bit....that hardware up top looks cheap as hell, I'll pray for you that those bolts never snap, and that the off centered, unusually small, center top bolt doesn't come loose on you. Again, sorry, but it had to be said.
That aside:
Is it possible to just swap top hats on coilovers like you can on stock struts? I would almost think that different designs between companies might make that a little difficult, but that's just a guess.
Secondly, you would have to change both the front and rears, right? I don't know too many places that sell rear camber plates and nothing cheap.
I have a feeling by the time you buy two sets of camber plates and get these to fit your car you're going to be more in the $7-800 range....in which case, there are better, proven options out there