It's for 2007 ST3 I looked it up, but it's not listed.What year is it? The parts manuals for all 2000 and up bikes are available on Ducati's site. Find that, look it up. If the part number is listed call your dealer or buy it online, If it's not, then you're stuck with eBay or salvage yards...
I probably have the parts manual for it somewhere if you tell me the year I can look.
Sargents don't.you could try seargent seats and ask for a replacement part as i believe theirs come with a new pin and they have to come from somewhere right. the corbin seats do not come with one or maybe its the other way around