Likewise I have wondered about these kits on eBay... Have decided to go with all my original bolts etc.

I have contacted Mcleod Plating re: getting my re-done. They guy I spoke too there was pretty helpful. But to get an accurate price you need go down and see them with what want you want done. Existing surface rust on bolts is not a problem but paint was ie: no paint. Also not sure how you avoid getting them mixed up...

http://www.mcleodplating.com.au/main.htm