Original supplier of J70 boats made in the US. They have the original fabrication jigs to build the stern pushpits. You'll need to measure the hole to hole center distance and provide to them for a drop-in replacement.
WHITE WATER MARINE, INC.
3755 W. Water St.
Port Huron, MI 48060
810-987-4837
A custom fabricated pushpit quoted by a local supplier was $800.