1987 CR 125 water pump housing corrosion

Hi guys, I don't know if this has been posted before, but I am working on a 1987 CR 125 and in need of replacing the right side inner clutch cover because of the "Honda corrosion" issues. I have found out something that may help others. You can use any year cover from 1987-2004 and they are all the same, the part #'s change but the part remains the same. I used a 1997 cover and after changing the power valve arm back to the 87 arm it bolted right up. So I will now paint it black with the rest of the engine and have an aluminum cover with no more corrosion issues. Oh and FYI on how to get the "Mag" out of the radiator, I just used a small flat screw driver with a long handle to open up the top of the radiator holes, then I taped on the sides of the radiator's with a rubber mallet to loose the material inside and then back flushed to wash it out. They are now clean and flow perfect! Hope this helps somebody out.