Buy custom made Round U-bolts at Dsuban.com Round U-bolts. Please call with questions or concerns. Choose Thread Diameter 3/8” (24 threads per inch, SAE) 7/16” (20 threads per inch, SAE) 1/2” (20 threads per inch, SAE) 9/16” (18 threads per inch, SAE) 5/8” (18 threads per inch, SAE) 3/4” (16 threads per inch, SAE) 7/8” (14 threads per inch, SAE) 1” (14 threads per inch, SAE) 1-1/8” (12 threads per inch, SAE) 1-1/4” (12 threads per inch, SAE)