I am putting my '89 renix xj back together after removing a bad motor and finishing up installing a different 4.0l that works lol. In doing so I've misplaced a few nuts that go to the exhaust bolts at the donut. I am curious if any of y'all would know the head size and thread coarseness of said nuts so I can replace them, and continue on my way to the working process of my swap.