I'm looking for a pair of cones for a 1st generation DuraAce front hub model HS731.
They're for a wet weather beater so they can even be used but not chewed up or pitted in the race area (or at least in better shape than the ones pictured).
I've tried several of the local usual suspects with no luck.
Wheels Manufacturing doesn't show anything close.
Loose Screws and Bicycle Parts shows some cones that look close but there are no dimensions plus they say:
"PLEASE do not ask us technical questions! Go directly to the manufacturer (through our links page) if at all possible, and be sure to read all the relevant technical information on our web site. If you have a serious compatibility question about one of the items on our web site, it will be OK to send us an email. Please be patient, and we will get back with you as soon as we can."
Oakland, CA USA