an australian valiant axle will also fit its a robust (pre1970 7 1/2) post 1970 7 3/4 inch axle used behind 225 all the way to 360. granted they broke a few but very well regarded the US IROC camaro/ ta firebird had one on coil springs 82-92
i have no idea if netherlands had australian valiants, unlikely as they are RHD, but you did have belgium assembled barracudas and potentially spanish dodges both of which might be a source of a better axle
Dave