Well if Richard Sachs says those are Bocama, then who am I to argue (and
I don't mean that sarcastically, he's the man). But I can't tell the
difference between those and the lugs I have always heard called Prugnat
S4.
If you can't tell the difference either (or they're close enough), then
widen your search to include "Prugnat S4" and you'll have more hits.
Those were fairly common lugs. I have a set, but you don't want to buy
them from me, my prices are too high. ;) (You can get back to me as a
last resort though, if you don't find a set anywhere else.)