Go to AutoWeld web site (they are in pennsylvania in case there is more than one popping up in google) they are the folk that make most of the kits for the commercial resellers - competition engineering for example. They might make a rear frame kit for your car, they might even have an installation video of how to put the frame in that car. The tubeing will be nice and thick - an 1/8th (11ga) is too thin, even if they don't have a specific frame for that car they will have a universal kit and they offer it tacked together as well. All the engineering is done for you. They also have a cage for that car - like Gary1 said, you will need the cage assembly to tye everything together (you may not realize it as of now, but when you cut the stuff out to install the rear frame and connectors you will be cutting your car in half and replacing everything from behind the drivers' seat - it needs to be resupported and the cage is what tyes it all back together. I have done this a lot.