The AP Racing release bearing is very robust & as Frank says, it takes quite a bit of engineering to make a carrier. The problem with the AP bearing is that the outside turns instead of the inside race. This means that the Renault carrier cant be used. There is a Ford Escort Mexico 1600 bearing which I have used instead. This is the right way round & is half the price of the AP. You have to break off the unwanted nylon plate. Very light machining of the Renault bearing carrier is required as the Renault nylon moulding is about 1/2 mm too small & not quite concentric. The Ford bearing does not look as robust as the AP, I doubt if it will last 60,000, but as I've only done 2000 miles it's not a problem to me. If you cant get part numbers, I'll dig them out for you.
Tony