muz, just use the escort rs turbo actuator bracket, should be fine aslong as the housing doesn't get spun round too much.
you really should have fitted a cossie housing though, flow better, A/R 0.48 or bigger will give loads more power with a bit more lag.
i made my own bracket for my 4wd cossie tubo though from some 5mm steel, works a treat.

you'd need to make a new downpipe or modify a cossie one, a single pipe is best to use for modifying, not the one that splits into two.