Just arms are fine too. ULtra tork or a square hole in the middle are/is fine too.
i just posted one on the ebay this past sunday. square taper, 172.5 compact. very very closed to unused.
Campagnolo Centaur Road Crankset | eBay
if that doesn't work it's under seller mikesibis. i didn't think any of the stuff was high enough pedigree to list here first.