subframe

Hello. I am looking at a 1998 Buick Century with a rusty subframe. I am not exactly sure how bad the rust is but I know I may need to replace it. I have been looking at car-parts.com and am slightly confused. Can someone explain to me what all front subframes/engine cradles would be compatible...

I know this is extremely common up north with all the salt on these cars. I have free parts at the junkyard so parts are not an issue. I found a whole new set of bushings, bolts, and cups almost brand new on another Lesabre. My question is why did the steering go out? Nothing looks broke under...