Need help with part name

[jennfurr]

My 1970 Chevy Suburban was in an accident tonight (rear ended), and I'm trying to search for replacement parts, but I can't figure out what this part is called, or what to explain to a local repair shop to explain what needs to be done.

In the accident, the ends (12") of the rear frame were bent downwards, and the horizontal piece of sheet metal that forms the door sill of the barn doors was severely bent. THAT'S the part/area I'm trying to figure out how to explain - the sheet metal at the bottom of the barn doors. Can anyone help?

And if there's anyone in the Orange County, CA area who knows a good body place, I'm looking

sorry if this is rambly - I've been learning from y'all how to fix up my truck, so I don't know all the terminology yet. Thanks to whoever it was who posted how to replace the hood springs. Worked like a charm!

Thanks --jen

(you should have seen the other car that hit me.... 2010 Nissan... it was totalled, and impaled by the bicycle carrier)