I ordered two sets of ameriglo fiber optic sights one has a red fiber optic front sight the other has a yellow. I want to replace both front sights with a green fiber optic rod. Can anybody tell me what size fiber optic rod I need to replace my front sight? Ameriglo doesn't have any replacement rod options on their website. Is it a 0.060"/1.5mm or 0.040"/1mm or some other dimension any information would be helpful thank you!