What 727 is this?

Can you see two letters, like PK on the driver side rail, towards the middle? The Seven digits after that will be the number. the above numbers don't match anything. 2801543 is the 67' A body, 2892031 is the 68 A body ,2892091 is the 69' A body. 2892093 is the 440 A body transmission. 2892007 is the 68' Hemi A body transmission.