Need help identifying bucket seats

I bought a set of seats that were supposed to be originally from a 69 Cuda hoping to use them in my 68 Cuda. At first glance they looked as correct as I could determine but my knowledge is limited in this area. The rails are the type that raise the seats like an a-body but they are not offset like my 68 so the bolt center is way off according to my 68 Cuda. Approx. 15" wide bolt centers instead of 12". I have seat brackets from my 68 that look like they will bolt right to these seats and bolt in the car so that's not a big deal but I wonder why the difference. Are 68 and 69 bolt centers different? The guy gave me some tags that were supposed to be from these seats but I never asked where on the seats these tags were located. The numbers on the tags are SS 3447540 T and the other is SS 9 16 69. Does anyone know what the part no. 3447540 T number fits? I'm reasonably certain the 9 16 69 is probably the build date. Does anybody know if the 68 and 69 seats were the same physical size so all I would have to do is order covers from Legendary for a 68?

Oh yeah, he also said seats from a 69 sport Fury and Barracuda were the same. Could these be Sport Fury seats instead of Cuda seats which might explain the different slide rails.

Any help would be greatly appreciated. Thanks, Tracy