A word of warning never go for zinc as dissimilar metal corrosion can occur. Always go for stainless if you can. Goodridge are good, I can vouch for them as they have been on my ZX6R for about 4 years and they still look good. (yes they are stainless)
Yes thats true,I was told this the other day, Galvanic corrosion can occur if two dissimilar metals are in contact and in the prescence of a electrolyte solution Like water each will develop a corrosion potential.
If the corrosion potential of the two metals is significantly different, and they are in direct contact and immersed in said electrolyte, the more noble metal will become the cathode and the more active metal will become the anode.
This is evidenced By storing stainless steel with aluminium in a damp location.
In order for galvanic corrosion to occur,there needs to be at least two Dissimilar metals ,Metal-to-metal contact and the Metals to be in the same conduction solution (usually called an electrolyte)
Its an interesting study as if zinc (galvanized metal) and stainless steel were in direct contact and in the presence of an electrolyte (water), galvanic corrosion will probably occur.
I remember the story of a copper hulled ship that had all its steel metal rivets corrode as a result of immersion in water (the sea) in the 1700`s some of the rivets were fine as the paper on the rivet head backing insulated the steel from the copper.
Probably Boring but interesting as well.