Drum brake wheel cylinder anchor bolt

[dbeard]

Hi all until I decide to upgrade to disc brakes I'm keeping my 67 shortbed front drum brakes. In trying to replace the front wheel cylinders the bolt that attaches the wheel cylinder and backing plate to the spindle broke so I need to new ones. The bolt looks like the one in the picture. Anyone know where I can find these or does someone have them lying around from a previous disc conversion? Any help would be great as I'm not ready to go out and buy new wheels and do the conversion yet!