1977 Twin KZ750B rear Sprocket bolt and fastener

Last weekend my chain snapped and got caught in the rear wheel. Messed up the sprocket, bolts and fasteners. The pic below is exactly what i need, but these bolts are for a 1977 KZ400. Will these fit my 1977 KZ750 rear sprocket hub, and if not, where can i find them?

Thanks in advance.