Oetiker # 10100008 or 10100011 will do it - https://www.oetiker.com/-/media/Fil...-Catalog/Oetiker_Product-Catalog_EN.ashx
Your local weld supply store would maybe have it. I am out of stock. Have it in 1/4"


1969-1/2 A12 LOH Road Runner A4 w/ M6S
13.34 at 104 PSMCDR 9/06 in Mopar Action 8/07
12.95 at 105.94 F.A.S.T. 11/06