I have an 81 11 special this is the bolt I bought when I put on stainless brake lines.
10x1.25mm Dome head double banjo bolt, Black, Venhill, brake hose line (200679825242). Now there are plenty of other good bolts out there I just got these for appearance. But this is the size you should need.
blkryno
81 11 SH (83 Venture cct, Tkat fork brace on, WezMoto SS Brake Lines, Stock style K&N Air Filter )
79 11 SF (83 Venture cct on the shelf for it.)
Semper Fi
Loud Pipes
Draw Cops
Don’t force it, finesse it.