63 Belair Floor Brace

[63guy]

1st timer here with a Head Ache - well, getting myself deep into a 63 Belair rust problem - tore out the inside rocker to find a brace that sits towards the front between the inner and outter rocker panels - actually welded between them and is the bottom lower few inches of the kick panels - Found a number W51R5371 stamped on one - the rust is at the end so not sure if the last number is 1 or other numbers that cancer got to before I did- Anyone know where I can get this part?? I have been in all the catalogs - Impala Bobs, Ecklers, Classic industries - I seen it called "Reinforcement, Front Body Hinge Pillar & Rocker" and too many bends to try and replicate - Anyone have any ideas??