If you cast your minds back to the mid 90's, you may recall the relatively rare ZX 1.9D Automatic. I believe this had the lovely fully mechanical 4 speed auto box the same as the 205 / 405 had (if someone could confirm that please?) , notice the lack of 306 D auto
Looking a bit newer, there was Xantia 1.9D and TD with an auto, again where is the 406TD auto ? , as far as I am aware these Xantia's and 406's had the later electronic box.
It must of been different perceived markets, as ultimately the parts bin was the same.
Thoughts appreciated as always.