Wastegate puck

#1
Will the smaller diameter assembly fit into the stock elbow? How difficult or feasible would it be to make it a bolt on style fit? I read only one weld is necessary but would be nice to be able to bolt on and remove if needed.
It is going on a car with stock down pipe and exhaust. Turbo is a dinosaur PT51 but it is in good shape and fitted with an aftermarket down pipe. I want to keep the stock elbow.
Thanks.

Jr
 
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