bolt

Hi I'm Dani, from Spain, I own a sanglas 400y (spanish made with a japanese engine) that has a leak on a crankcase bolt because aparently the PO tightened it too much. Here you have pictures (bolt 10) to identify it and I would like to know a good way to solve the leak by myself. I was thinking...

Will any other XS400 or XS650 swingarm bolts fit the '82/83 Maxim/Seca? I'd love to use one with the zert fitting on the side. Anyways, it looks like mine is stuck and will need to be drilled out/cut off so I'm just seeing what's out there that will work...