Welcome to the site first of all.
Your best bet would be to search and see if you have any old insurance records, the should list the VIN. Same with old registrations.
If you can not find any paperwork on it, try the insurance company you used then, they may have a record of it.
If those strike out, try a letter to your DMV, some states will do "reverse" lookups for you, but most of the older information is not in their computers.
You can also post old photos of it and hope someone recognizes the car.
Best of luck!
Barry