Help me restore my Oris Diving Watch 7533p

Hi guys, I need help restoring my Oris Diving Watch 7533p. I recently bought this watch because I love the look and history of Oris watches and being a keen diver I thought it would be cool to have a dive watch that I can wear with a suit and not look gaudy like so many do. The watch keeps good time and I will have it fully serviced and pressure tested here in New Zealand before I get in the water with it. I have looked around on ebay and the net to see if I can find a NOS bezel for it but no luck so far. So, does anyone out there know where I can find a new bezel for this so that I can restore it to its former good looks?? Any advice would be appreciated. Cheers, Pete