I'm no expert, but if you're not boating in salt water, I suggest a stainless steel through-bolt design as 64osby also suggested. The bow eye is above water level which reduces the conductive path for a complete circuit needed for significant corrosion. If the original broke, you need something stronger such as stainless with a substantial backing plate inside. I'd also suggest a bedding material between the eye and the hull, not for isolation, but to keep any splashed water from being trapped and acidifying. - Grandad