(all written from memory: errors all mine)
Peugeot and CitroŽn have been sharing floorplans since the late 1980s.
The various model correspondences I can recall are:
405 - BX
406 - Xantia
306 - ZX, Xsara, Xsara Picasso
106 - Saxo
206 - C3
407 - C5
307 - C4
It would take someone far more knowledgable than me to say how much of
each model is the same and can be bolted directly in, but Peugeot
themselves put the rear suspension from the Xantia into the 4 wheel
On a not unrelated topic, I imagine a 406 coupť with Activa innards
would be a very very nice car to own.
c3-po ( snipped-for-privacy@AMICORE.CO.UK) gurgled happily, sounding much like they
were saying :
Not a chance, not wholesale.
You may be able to use the seats, say, probably by making up some bracketry
- but, hell, I've got a set of BX seats in a 2cv van...
Things like door trims etc, forget it. You can't even use (for example)
late Xantia door trims on an early Xantia without changing the entire dash.
107/C1 and Toyota Aygo are all the same car. C2 and C3 use a different
platform, but as far as interior goes, you're dependent on far more than
just the platform - the
Really, there is no way. Think about, for example, the shape of the door
trims - very dependent on the door shape. The doors aren't shared. The
doors aren't even shared between 3 and 5-door versions of the same car.
When it's said that they use the same "chassis", they really mean the
grubby bits, the floorpan, p'raps some of the bulkhead structure - not that
large chunks of what you see are the same.
Not even that, just the mounting points , the shape of the
pressings can be totally different, sometimes the same mounting
dimensions are kept, sometimes there not (for example the floor pan
can be longer in a 5 door than the 3 door version).
 thus use the same jigging brackets for build and repair.
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