Where can i get Silicon Bronze P Bracket Bolts

I’ve got the p brackets off my boat and the bolts are stainless steel , do I need to change them to bronze ?there doesn’t appear to be any problem with the dissimilar metals , all seems ok , the p brackets just have counter sunk holes in them , and just have counter sunk bolts with washers and nuts on the inside
 
I’ve got the p brackets off my boat and the bolts are stainless steel , do I need to change them to bronze ?there doesn’t appear to be any problem with the dissimilar metals , all seems ok , the p brackets just have counter sunk holes in them , and just have counter sunk bolts with washers and nuts on the inside
My 1984 Sadler has countersunk stainless steel bolts fastening the skeg, P-bracket and three Blakes seacocks. All are original and when last checked were in perfect condition.
 
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