late be1 boxes have the holes for the be3 style clutch arms, the ball pivot should just unscrew.
you can use a 306 gearnox without issue, just swap the bare diff (retain the original crownwheel to that gearbox)
you can use a 306 gearnox without issue, just swap the bare diff (retain the original crownwheel to that gearbox)
need a part number? http://public.servicebox.peugeot.com/ and http://service.citroen.com/ will sort you out.