Wanted: Center Cases for 175

[Chakka]

I just split the cases on my Jackpiner and the crank area has some bad magnesium corrosion. No holes but its all pitted and rough. I know its a long shot but does anybody have a set of center cases? Or even a 175 engine they wish to sell? I am looking for the silver motor, 74-77' though if its a complete engine up to 79'
Thanks
Chris