Door Frame Part ID?

Anyone know what this part is called? I noticed the parts on each side of my 72 Riv have those gaping holes... not normal? Are they available or made from that that mysterious "unobtainium" material? Thank you

 

I dont know the actual name of the part.... It is included in this package..... Maybe the sell it only..
http://www.oldbuickparts.com/product_info.php?cPath=27_28_411&products_id=7226

Maybe 3rd one. http://www.oldbuickparts.com/index.php?cPath=27_343_396

 

Thanks Bob! Hope all is well on the "Other side of the hills."

 

No Problem....... I guess its a case of I know it will get better. Tick drip flip..