Rear Crossmembers

[mikester]

I own a 2013 Silverado 1500 crewcab 4x4. Trucks in perfect shape as far as body and interior. Chevy just did a new 5.3 in December under the extended warranty due to oil pressure issues.
The only problem with the truck at this point is the rear crossmembers look like swiss cheese. This happened over the past 4 years. When I bought the truck down in MD the frame and crossmembers were perfect.
Any companies making replacements for these ? I'd rather spend some money repairing whats there. Cant afford a new truck.