Will these front seats fit my 240K coupe? or is it going to be a BIG hassle?

any suggestions will be great

This is pretty unchartered territory I think... you might be on your own on this one!

might get some measurements then....

As long as the width between the runners is the same you can do it without too much trouble.

cant find any measurements for the Z32 seats

so I will just have to wait till I get the dimension

going off what alfadog said, you may be on your own BUT you'd probably be the pioneer for this and pave the way to another option for Z-ers looking to do a quality, but inexpensive(well, cost yet to be seen) seat swap project. i'm sure there would be more than a few of us that would love to see the writeup on it. i say GO FOR IT.