Cart Before the Horse
If it turns out they don't fit, someone will get a really nice set of seats. I ordered the Leatherique re-dye kit for them the other day to freshen them up before I put them in. I've invested (i.e. spent) too much on them and raised the wife's expectations too high to not put the seats in.
You know what they say if it doesn't fit...force it. If it still doesn't fit get a bigger hammer. At least, that's what the "technicians" say at the Cadillac store where I work.