I need the top carriage bolt and nut for an earlier 60's Ludwig rail mount. It holds the tilter and L arm. It is a smaller diameter then the bottom one that holds it on the rail. Didn't notice until recently that the later 60's rail mounts had both the same size carriage bolts, the larger diameter.

Could use a L arm also as mine has a crack at the bend. Would like the cross hatch knurl pattern type.

Thankyou