I can't get another set of these heads, they where sold many many years ago when those cars where sold new here, they where part of a package wich included a different exhaust (the connection is turned 90°) and has a larger diameter, reinforced rear axle, stronger front driveshafts an some kits included a rollcage.
The heads need a different camshaft than the stock one, wich i dont have any more. But Leoneturbo the guy from holland and probably my closest neighbor thinks he can find that camshaft in japan.
My father once had a hatchback build for the dakar rally with the full kit (i forgot to mention the coilovers) and sold the car to a guy who breaked the car 6moths later, without ever driving the car.