Easy swap for a seat with all the bells and whistles does not exists, unless you have the cash to make all custom fab work easy. I installed the seats out of a Civic SI in about 9 hours of work. It would have been quicker but I did not modify either the LC or the seats.
Like Silvia said, there is no cheap or easy seat replacement for a 60 series. If you're willing to pay the money to have custom brackets made up, it CAN be easy. I put Mazda MX6 seats in my 62 and it's probably the best large sum of money I've spent on my truck. I have a thread here detailing what all was done.