i use the cpc ones with no problems, i chose them cos i can get the genuine green ducati o-rings easily, i change these regularly and havn't had a leak.
Sorry no direct link to "cpc" but i picked mine up at the Ally Pally show, they were inline the type. Just be carefull to position them so they don't touch anything......or they can undo!.......whilst starting my "92 strada up in the drive, wearing shorts...to let it warm up, whilst putting on my leathers, i noticed something cold on my leg......the prop for the tank had pushed the Q.D. button and disconected the fuel line under the tank, spraying fuel out of the right hand side of the bike! I repositioned the "cpc" no problems since. Steve Robins s.w.
I kid you not, check out Halfords. I was in the Middlebrook store (Bolton) last week and shock, horror, probe, phew wot a scorcher, there was a packet of the female white plastic connectors (two of) in the fuel items section. They looked exactly the same as the ones on my SP4S.