Took a chance that they would fit since the Twingo is based on the Clio. Nope. Ended up swapping the RS seat back and base cushion onto the Twingo base and rails. Hated my old seats tendency to stain easily though and these are properly bolstered so totally worth it! Pics of the carnage, then finished passenger seat below.

Hooking up the cables for the folding mechanism was pretty challenging and the steel base bolster supports are missing on the Twingo frame. I’ll need to cut them off the Clio base and weld them on the Twingo frame.