Here is one that has been pretty good for me. You can also view your VIN specific parts diagrams.

https://repairlinkshop.com/Account/Login?ReturnUrl=%2F

You can make a free account with no verification. You do have to select a dealer for whatever make you are searching. Then enter your VIN and you can get the option codes/view the attribute list. I've used with GM and Ford so far with good results but it connects to over 20 OEM's. Results may vary.