The new ones that I plan to put on were anodized to prevent rust in the cooling fins. The old ones have been down to minimum thickness for close to 8 yrs and I don't want to use them anymore and are quite rusted in the fins. I plan to get the new ones machined tomorrow and have them on by the weekend. That will be one less thing to worry about on my civic. I'll probably put on new screws after drilling out the old ones.