Flex plate cracked

My guess would be either metal fatigue from long age or an after-market one with inferior metal. I had a cracked flex-plate in my 2002 3.8L Mopar. It had cracked all around the crank bolts and rotated 20 deg, plus radial cracks. That seems to be a common problem in the 3.3/3.8L V-6's. The cracks looked like brittle metal. I recall that both the original and dealer replacement were stamped "Canada". There are after-market racing ones for SB & BB. I don't know if they fit a slant (same crank holes?).