My friend has an 06 Stratus 2.4 L that needs to be replaced. He bought another 2.4 to put in it just to be told that the transmission is from an 04-05 PT Cruiser.. They said that in order to know which motor will fit they need the serial number off the old one. Problem is, he already sent it in for a core and they dont have the numbers or a paper trail to find them. Any input on what he should do?