Backing Plates and Idle Control Valve

#1
I own a 1999 Toyota Corolla Liftback, 1.6 automatic. It failed last years MOT with one of the rear backing plates being corroded through. I was told that as an obsolete part to get it back on the road I would need to get the part from a breakers, which I did but real expense considering it wasn't in good nick but got the car through it's MOT. I may have a similar issue with the other rear backing plate. Just recently the Idle Control Valve is playing up. Again no chance of a Toyota part unless I have £200. I'm on many websites and can't find a patent part and neither can my garage. Otherwise my car is excellent. Has my car reached the end
 

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