Likely to be the case. I got a 7MGTE rear housing put onto my Caldina CT20b (the one with the integrated manifold and housing) by the turbo guys. They said there is a bit more clearance than stock between the housing and blades but it should be ok. I translate this to be a bit more laggier / less power but meh it'll do for a start.
The circlip should fit no worries as the locating pin is either in the front housing only or you can easily remove the rear pin and rotate the housing. You will need to see if the 3sgte CT26 compressor intake and wastegate actuator is in the same position as the 7mgte CT26 though.
I'd be looking at doing this as a cheap option where you don't mind too much if it is a bit worse than the stock turbo.
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