19c is not the rear housing.
The reason is the break down of the name of your turbo, TD06-19C-10cm, is: TD06 – describes the size of the core and exhaust wheel. “TD06” exhaust wheel = 55.2mm/65.0mm. 19C – describes the size and family of compressor wheel. “19” compressor wheel = 49.5mm/68.0mm, “C” = family type, there are also B, G and D types. 10cm2 – describes exhaust housing size.