The notch for straps meant for buckles have a smaller cutout than the ones for deployants so if you really want to use it for deployant, you'll have to make the cutout bigger.
Straps that are to be used for deployants need to be thinner, at least at the end area compared to straps made for tang buckles since you have to insert that into the deployant.
They have some on the bay for $70 including deployant.
Hont do sell asso strap with deployant buckle, can try send him a mail.
http://forum.replica-watch.info/vb/showthread.php/panerai-ass-brown-112167
Thanks carlton, i appreciate the help!