I needed the seat clamp for my 2015 Giant Defy as one of the screws had threaded, I couldn't find one anywhere online - Giant dealers etc, but I got one on Friday at the Giant store in Cambridge Hills Road ( part of
Rutland Cycles ) as they had a few in stock, but only the one with holes for a rear pannier for £9.99. I'm sure they would send one out if you called them.