[dsmit412]

Looking for some help decoding a vin 8R91F520684

 

[CatsRock]

You can also decode the door tag info from another tab on this site

Ford Mercury Cougar Xr7 - VIN Decoder

VIN stands for Vehicle Identification Number and it's as unique to your car as your Social Security number is to you. Because it is unique, most states use this number for vehicle license registration, but to classic Cougar enthusiasts, the VIN serves another practical purpose. It is our first...

fordmercurycougarxr7.com

 

[70B302Cat]

The VIN decodes as the 20,684 th Cougar assigned a serial number to be built at the San Jose assembly plant for the 1968 model year. It is a standard (non XR7) equipped with a 302 2 barrel engine.
Try here with your door tag information.
Mercury Cougar VIN and Door Tag Decoder