I think Fratello has the width of the clasp wrong...did they physically measure it? Several people have already installed the Chronoscope clasp to their Moonwatch bracelet and it is is the same 15mm width.
I already ordered the parts (both O117STZ013899
& 118stz013110) with my AD, they actually called me today and told me it should be in next week. In addition, they told me if 118stz013110 is not needed, they can just return it to Omega at no cost to me. Didn't have to pay for the parts up front, they just special ordered it, and they will install it for me. I'll bring my extra links just in case it needs to be added after the new clasp is installed.
Lastly, WatchAdviser had an excellent video with Omega on the Chronoscope. I commented on why no quick release spring-bar on the ref and the moonwatch and he responded......."There will also be a solution coming to quick exchange the bracelets and straps..." Nice...