I am still curious as to if there are different markings on the various makers OPDA's or is there another way to see what I have in there now. I know I have an OPDA, it is an 06 with a 4.0. What I do not know is has the original been replaced.Other things- how is it possible that so many people lack the ability or foresight to hop on Rock Auto, click on TJ, ignition, distributor, camshaft synchronizer, OPDA, click on part number and then look at the buyer's guide that tells you which years have what?