Ron,
I don't make the seat covers or any way related to the maker, just got Tony to make me replacements, he can make what you like if you have low back front seats unpick the covers so he can make the patterns, Mine are 1972 and had the tilt lever half up the back there are no holes cut on the new covers for side lever, so I would assume you can use these covers on both styles, just when fitting mine I will make a small cut/hole provision for the upper side lever, easy as.
I'm very fussy with my cars and I'm very satisfied with the product it is a genuine copy of the original/foam inners, metal rod support where hog rings attach, basket weave vinyl etc and so are others Tony has made trims for, He does a lot of GT Falcons, Torana, Monaro stuff too.
As for the actual seat foams, mine are like new so I will be fitting them as they were, If your foams are destroyed don't think there are any aftermarket options except fabricate sections from a supplier like Clark Rubber etc who can cut & supply foam & glue/bond back, or try source another decent seat to salvage the foam.
I will be fitting the covers in the coming weeks and will upload images, Just got to detail a few items, My original trim colour was Saddle on a standard worthless rusty 4cyl Capri-So you matching number GT V6 guys don't kill me, I hated the colour so will be spraying black the plastic covers and other little items on the seat.
The seat backs being plastic can either paint black, but I will cover mine in vinyl, easy job with a bit of spray adhesive & razor blade.