Hi,I recently bought a spare for my RD07 on ebay so could measure for you. The only snag is that I can't guarantee exactly what it is. It was someone else's spare cable and not in original packaging, so it could really be anything...
I could compare the throttle cable from the rd07 & RD03, if the rd07 throttle cable is longer then the clutch cable should be alsoBummer. Just spent ages searching through the garage and found everything else but the clutch cable.
I can tell you that throttle cables' length is:
Cable length [ tip to tip ] - 1055mm
Black sheath length [tip of threaded thing that goes into the leaver to end of sheath : 860mm
But no throttle cable to be found anywhere tonight. I will try again at the weekend if noone else beats me to it. Sorry.