They are a lot longer than the stock bolts. I lost one of mine last year and only noticed when I was switching to track dress. Who knows how long I was riding with only 1 bolt. You cannot buy the bolts alone unless you buy the seat. No replacements from Ducati. So I went to Home Depot and if memory serves me its a M5 x 22.5mm length. I bought some M5x25mm as they don't carry the 22.5 length. It may be a M6x25mm. By both just in case. about $1 for a bag of 2.
Try to get ones that are not prone to rusting. The way it is located in an indentation means if you ride the bike in the rain a lot, or if you don't dry it properly after washing, water stays ere and rust happens very quickly.
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