dont know who made the manifold, i swapped a few things i had for it from a guy on the calaisturbo forum. as for the measurements, the innermost edge of the turbo flange is 11.2cm from the head port flange and the outermost edge is 18cm from it. in comparison, the innermost edge on the turbo flange on a standard vlt turbo manifold is 12.7cm from the head port flange and the outermost edge is 20.5cm. so if you were going to go a bigger turbo then this manifold should offer better clearances from the towers/chassis rails etc if they are of concern. as for pics of the T3 split pulse flange they can be found in the following link.
My Webpage