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You would want a '205 that came off a TH350 (i.e. is 27 spline)... most '205's are from SM465's (10 spline) or TH400's (32 spline).
You'll also need the adapter, the "foot", that goes between them. Drive shafts will likely change, as a '205 is shorter than a '203.
You know, for all that work, you're halfway to a Doubler: get a TH400 version 205 (more common than a TH350 version, methinks) and a Doubler from NWF or ORD or whoever, plus all the above, and you're golden.
You would want a '205 that came off a TH350 (i.e. is 23 spline, or whatever a '350 is)... most '205's are from SM465's (10 spline) or TH400's (29 spline).