i dont think any of us have seen one on a series 1, so we cant give you a definite answer either way.
i know it will need to be welded in like on my 96 b/c we dont have a bracket to conect the dp to the cat.
what you may want to do, is look up the part # for the 95 and 96+ riv downpipe and see if they match. that would tell you for sure if the zzp will work.