A:
I did not find a size chart, but I read reviews from other people and they were right on! I purchased 3.5, 4.5 and the #5 willowleaf blades and they seem to be perfect!
I would use the the 3, 3.5 and the 4.5 willow leaf on the 1/4oz Spinnerbait. I had some #3 willow leaf blades that I had purchased earlier and matched up the #3 with the 3.5 and I even built some with the 3.5 and the 4.5 blade combination and they seem to work fine!