i don't remember where or when i saw it, but someone used one of these, or one like it. It worked, but it took alot of porting to get the airflow right. didn't match up perfect.
It simply has the holes drilled for both 1ZZ and 2ZZ manifold studs. Depending on what turbo you hang from it, you might not have clearance to the rear x-member.
They were prone to cracking because the castings were too thin, and the turbo they are flanged for is horrible.
Different shapes yes. Different spacing not so much. But as I said, the manifold as it comes is not fit for use - it has to be modified.The exhaust holes on the 2zz and 1zz have different shapes and are spaced different.
I tried one of the dual fit manifolds and was not happy.