Wald basket legs too short for cruiser -- how can I install the basket?
I've seen both P-clamps (a.k.a. brace clamps) and the similar, ratcheting versions used. This is actually the preferred method for some front racks on bicycles without rack braze-ons on the fork. As long as they're the right diameter, and there's a little rubber (even an old tube) between the fork and the clamp, it should work fine.