Brake line bolt size?

[kipps]

Does anybody know definitively what size the self-tapping bolts are that hold the brake lines to the chassis of a '87?

Or alternatively, know where I could buy exact replacements? (Just the bolts, not a complete clamp kit). Stainless would be nice, but not critical.

I do know that a 1/4 drill bit cuts a perfect size hole for them to cut threads into. I'm building a custom dual tank filter arrangement for an LS powered truck. I want to use a number of these bolts to fasten the filters in the bottom side of the rear cab mount crossmember.