I did this 2 yrs ago on my 28' S2. The 22 yr old rigging looked ok but
i read an article about inspecting the ends with a magnifying glass and
sure enough I found microscopic cracks in nearly all ends. These
cracks were longitudinal and very thin. I tried dye penetrant testing
but that crap didnt work. I took one set to work where I have a
plethora of microscopes and sure enough they really were cracks.
Replacement cost me about $1200 from West Marine. I think you could
find a better price somewhere else. While you are at it, you should
also replace your lifelines.
Maybe this week I'll take one of the old shrouds to work and make
photos of the cracks and put em on the web. That might be helpful to
some ppl.