I think I've asked about the same thing before. Here's some of the possible mounting options

Low Down Mount 2 is on the hub instead of the fork.
Low Down Mount 1 is also on the hub, but more friendly to the lights with Q-R set-ups that go on bars.
Gino Mount from Paul Components mounts to any M5 eyelet or braze on. Mid or lower fork, your choice.
Minoura Besso uses a clamping band to attach itself to the fork or any other tube it'll fit on your bike.
NOB sort of like hose clamping a plastic dowel rod on.

Probably some others I'm forgetting right now....