Baron Corpuz (ebay store, banana brain) carries NOS Shimano 600 hoods--you may want to try there first.
>I have picked up an old shimano 600 group, and have been cleaning some
> the parts to put them on my bike. I was wondering if anyone had any
> about cleaning off grease/dirt from old components, and shining them up
> Also, the hoods on the brake levers I have are DONE, and I need to
> them, which is proving to be harder than I thought. The levers are
> I was looking at the newer line of shimano stuff, and the ultegra hoods
> definitely a different shape, but some of the duraace brakes look like
> might fit. Anyone?!?
> -Adrian Levick
> San Francisco, CA.