Locking rings for split paddle...

Hi, I bought my first kayak yesterday and the seller gave me a 2 piece Canoe sports paddle...I didn't ask him its age but its a Series 2000/160 (?).
The clamp that binds the 2 halves together has seen better days and I'm wondering if its possible to get these as replacement parts, if anyone can point me in the right direction I'd be grateful, cheers Barry.