What kind, options, etc.
Holy cow, those prices are astronomical!!! McMaster-Carr has 1/4 x 3" silicon bronze carriage bolts for $1.94 each (a 5 pack for $9.70). If Glen-L doesn't have it then check Jamestown Distributors, Clark-Craft, Defender Marine, or Hamilton Marine. I would use only silicon bronze screws and bolts.