I'm afraid the link you got was an attempt at humor ... to most people here, putting a bodykit on an f-body is sacrilege.
I personally don't care what you do to your car, it's yours, and it's your money ... whatever churns your butter ...
Bageco
This is a company that sells these kits ... i tried ordering one, but they couldn't (or didn't want to) ship it to Europe.
I got my kit (not installed yet) from JC Whitney. It looks like they don't sell them anymore, but you could always drop them a mail ... they were very helpfull for me !!