When I broke the front sight on my muzzle loader (every single year!), I just went to Sportsmen's Warehouse and they sell a few different sizes in the archery department. I wasn't sure and told the guy I'd run home to measure and just ended up ordering on Amazon. Not only was it the size that was most available in the store, but it was something like 60% of the price of what I paid on Amazon. Make sure you price check local before just defaulting online.