Check the fitment of the rear seat in this Imperial. The Imperial is similar to your car. The red rear seat in this pic,
https://www.forfmjbodiesonly.com/cl...407876128715_3939493129191370152_n-jpg.17796/
is out of a 4 door 5th Ave. You can see how it cuts back at the corner edge, not cut straight across like your 2 door rear seat bench.
It looks like it might hang a little too far forward, or maybe it just wasn't fitted in fully. This poses a possibility that the rear seat bottom is deeper in the 4 door cars. My rear seat bottom bench measures 20 inches deep at the center of the bench with the tape measure 20 inches out to the visual edge of the front of the seat.
Just off-center where the frame is extended a bit at the rear and the padding adds a bit to the front, in a simple measurement eyeballing it has a maximum depth of about 21.5 inches.
You might take a measurement of your rear seat to see if its much less than 20 inches in depth. It would be good if that were the case, you can just hog-ring the cover at the appropriate length since you're likely to have too much material than too little.
So, this adds to your question about 'bolt in'. The 4 door rear seat bottom may not pass inspection if it doesn't fit right, requiring the transfer of that cover to the 2 door seat frame.
This is one more plus to have the covers removed from the frame before shipping, you'll have to do it possibly for the rear bottom seat if they don't interchange.
For the front seats, I have a distinct memory of having to switch my passenger seat track due to a change in that side's floor from a 1984ish 5th Ave to my '77 Volare's track. The driver's was a direct bolt-in fit.
BTW, when removing bolts from the underside to the seat frame, it's worth taking the time to scrape off the undercoating. The bolts will break if this isn't done.
There's also another way of doing this. When they ship, have them at least take off the base and you can use your own. I believe the topside of the bases were never altered, just the bottom where the floor pan changed.
If weight isn't an issue in shipping, then yes, it would save you some labor in putting on the covers. I happen to have some experience with covers and I tend to look at it as an easy procedure, but its not exactly all easy. So if you can save some labor and the weight isn't important, yes sir, you've got an 'almost bolt in' set of seats. You'd just have to, and only possibly, depending on what floor the Cordobas had and I don't know the answer to that, at most just switch out the passenger side seat track base from the underside of the seat frame. Its easy.
The rear seat then has that other issue. I don't know if the seat back is exactly the same but I would tend to think it's a simple fit and bolt down.It looks like it fits in the photos of the white Imperial At worst would be undoing the hog-rings with some pliers and re-ringing the new cover to your old frame. The rear seat bottom, as well. At worst with any of this, it can be resolved just with switching the covers if one of the frames don't fit.
So you found some blue leather seats?