Yes, do locate a cast iron pan.
I had one bolt come out of mine (K301 12hp in a 128) after about 20 years of use, I discovered that I had an aluminum pan. It looked like someone had done a helicoil on it before.
I tried to cheap out and get another aluminum one from an eBay dude that promised the "holes were just fine". Well, they were not. I ended up getting a cast iron pan, used new grade 8 bolts and lock washers, new pan gasket, and a thin film of "Ultra Blue" Permatex sealer on the pan and the motor bottom.
It's 100% now and will be for another 20 years or more.
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