How I did it originally is I cut the bolt holes out of the OE rails and notched them, then fit the AWD protege rails over them and welded them to the car. Worked great, problem was after I lowered the car the pumpkin was too close to the ground and thus I have cut off the Pro rails and mostly cut off the OE rails, I will be using 1/8" 1x2" square tubing as my new rails and I will drill ans sleeve the holes with a bot in the trunk through the rail. I will probably only tack weld the bolt head to keep from rotating. simple as pie. well mostly
But all moved in, well like 95% done. still have to clean up the old place. Install my new hitch for the GS, rent a tow dolly and drag that Clunker down to the new place