Lots of places sell bronze hardware.. Problem is getting a good price and not having to buy a huge quantity. I've used these folks with good results http://www.greenboatstuff.com/fasteners.html
Jamestown Distributers is another good source, as is McMaster-Carr. I believe the length on the W32 was 1/4-20 X 1.25" (Pan head screw), but would recommend that you verify what your boat needs. There are variations out there.
Good luck. Mike