If it was salt water, you have more things to worry about than just the K-member. Check ALL electrical connections in the engine compartment for excessive corrosion. Inspect ALL suspension components. You may want to consider changing all of your fluids (rear-end, transmission, power steering, etc.). Pull up the carpeting to look for moisture/mildew, and rusted or freshly painted seat brackets. I noticed when I looked inside that car it reeked of some sort of new-car scent, which could be covering something up.

I'm not ragging on your car in any way, but you really need to get a qualified mechanic to check that car over with a fine tooth comb. Flooded cars are no laughing matter...especially if it took a dunk in salt/brackish water.

Good luck with the new car.