How narrow are your dropouts? And are you sure you have a front rack?

I have an OMM Cold Springs rack on my LHT, and, while it is wider than the fork (100mm, I think), it's made with that in mind. I had to replace the quick release skewer of the front wheel with a wider, rear wheel skewer, and all was well.

Nice thing about this type of attachment is that it should work with most forks regardless of what attachment points are on your fork. If you don't have brake posts, you can use p-clamps for the upper attachments. However if you have bolt on axle, I don't know how that would work.