318 magnum vibration.

I ran the numbers and it is definitely a 318 magnum. I pulled the engine from a 2000 dodge van. I bought a flywheel from Tony’s Parts on FABO. It bolted right up. Could he have sent me a 5.9 flywheel ? How do I tell the difference in a 5.2 and a 5.9 flywheel ? There are no scallops or added weights on the flywheel. Thanks for you guys replying. Rick