this will help
http://www.frigair.com/radiatori/riscald.pdf
this lists most european makes of cars and the heater cores that go with them. if you look at the pictures in the odf you will see the rad type ra is copper and al is ali.
the copper ones are
audi 100 ,200 ,a6 1994-1997,
citroen c25 1985-1990 , c35
fiat 127 , 128 , panda , ducato 85-90
ford fiesta 1976-1983 , fiesta mk2 1984-1988 , transit mk 2, mk3, mk4 , mk5
iveco daily 78-89
opel kadett d , kadett e , corsa B (these names are differant in the uk) look for nova cores.
peugot j5
renault r5 tubi , r9/11 , espace tubi 84-91 , express tubi 85> , rapid tubi
scania 113 - 142 - 143
seat fura
the nova is a perfect fit for a cheiftech case.