I have a 1970 Mgb with the passenger seat that doesn’t move.my question is can I just reupholster the bottom and back without doing the headrest

It's best to that under water

Don’t understand

Had to read your first post a couple of times. Not a 914, but MGB?

If it's a 914, yes, you can certainly replace sections, but it gets spendy and hard to do. Undoing stitches and finding fresh material to sew can be tough. Might just be cheaper to redo the whole backpad?