ISDT Information needed

[1sogdusm]

I have attempted locate information about the MZ ISDT 175 but have not had much luck. I have several 250 ISDT bikes and I am trying to determine if the 175 uses the same bottom end as the 250. I have one ISDT that is missing the top end and I was wondering if the 175 top end would work on the 250. I don’t have an extra top end for either displacement but thought it might double my chances if the 175 would fit. Thanks in advance for taking the time to answer and please feel free to message with information.