anode question
 

my boat has a mercathode system. it also had these http://www.ebasicpower.com/c/ALLZINC...89A8_thumb.jpg

when i removed the transom plate those bolts were so corroded that i thought my socket was too big a slipping, but the bolt broke... that easy...

are those the correct bolts to be used even though i have the mercathode? i seem to remember seeing somewhere that mercathode boats use different bolts

anyone???