I have Cinelli Uniblock cleats for sale on eBay that are closing tonight. While I have yet to personally install and use a pair of these cleats, they match up perfectly to Campagnolo quill pedals (assume that's what Cino designed them for).
Cleats can be viewed at the folloiwng eBay address, or search item #120417486836:
Regards,
Kevin Kruger - Grantville, PA