I wouldn't have mentioned parts not lining up etc if I didn't
have a reason to, and by that I meant using parts from other
turbo's rather than splashing out great wads of cash to have
the original housing/s machined to fit around bigger turbine blades.
Often than not, the original housings cannot be used as there is
not enough 'meat' on them to remove/open them up to, so that
they'll do the job and clear the turbine blades, hence why you will
see references to using TD04/TD05 turbo's and/or parts of them
by tuners/modifiers as they can be used as simple swaps without
any expensive machining work being required...saving money.
However.....if you use non-Brab/Smart parts like the TD04/TD05,
then bolt holes for things like mountings or actuators won't be in
the same places as the original Brab turbo, ok.
Does that make the 'picture' a little clearer now ?
Musmart can and will tell anyone of some of the pitfalls that there
are; or can be; on that score as he has already been down that path.