1969 Chevelle SS 300 deluxe post, just curious

[red69er]

I own a Red 1969 chevelle ss 396/325hp post car, it was bought by my dad in 69 at a small dealership in Fredonia,KS.
It came with the rubber floor mat, the bench seat with the white strips that I have seen in some pick but mine came factory with a 3 speed manual on the floor that i've never heard of any others having.
Just curious if anyone else has ever heard of this or it is pretty rare, I have all the original document from when he bought the car still in the glovebox and hope to have it up to tip top condition someday.