OK, so the jean covers just had to go. Jean pockets? Probably a great idea at the time, but slightly dated now.
The bad news is that once I got the denim covers off, all the original vinyl beneath had been removed. I'll have to see about getting the front seat recovered to match the original vinyl on the rear seat.
BTW, anyone know what the "buttons" are on the backs of the original front seats? I have no idea what these things do. There were two of them - one in back of the driver's seat, one in back of the passenger's.