If you're willing to spring for the $$$, these are the closest looking "production" mocs available for replicating cuarans:
http://www.arrowmoc.com/pt.html

Otherwise, your best bet is to put together a center-seam moccasin kit, and cut off the side flaps:
http://jas-townsend.com/product_info...roducts_id=246

As I've oft-maintained in other threads, those "ghillie brogue" patterns, with the mulitple tabs, are simply not correct for the Jacobite period or earlier....