Sorry to hear about that. Have you contacted your district attorney or consumer affairs department about this? In some areas selling a car without airbags is illegal. I'd spend more time on this than trying to fix the car.
You'll probably need a lot more than airbags. IIRC, in your previous post it showed a code for the SDM. That will probably need to be replaced and then programed by a dealer to work properly. And do you know if the crash sensors were replaced? I would doubt it. Impact bars, absorbers...? There is a lot that needs to be checked out to make sure the car is safe.
Also, if you are going to DIY, do you have a set of service manuals? The airbags are explosive. They need to be handled and installed properly to avoid injury.
Good luck with everything.
_________________________
99 Navy Blue Metallic, black interior, 6 spd, Z51, HUD, R8C (Museum Delivery featured in the Jan 02 issue of Vette)