Start with the last known state where it was titled or licensed. Many states have DMV web sites. You can download the appropriate forms to request a title or registration history for a small fee. A lot depends on the privacy laws in the particular state and who handles your application. Luck plays a big part. Post the VIN here. It's a long shot. but ya never know. Circumstantial evidence can lead you to an educated guess at what your LA car might have been but without the original motor or paperwork you are SOL. (Been there...am still there) BTW, rears aren't VIN stamped and can only be date/application correct unless you have a POP. Welcome to the site and good luck Neal.