I have found a piston that looks just like mine. But Instead of 9197 its 9198 and it has an arrow on it which after looking at the bently that just means which way to install. I didnt see a + on it though, but the arrow confused me a little so I might have missed it. The guy wanted $100 for it (used). Is that reasonable? It seemed high compared to a regular used piston ($30). Also the ser # on my block is 1284902. Thanks ScottM