KZ400 Centerstand Interchangeability

I have a 1976 KZ400S I'm bringing back to life and it only has the one kickstand onthe left side. Does anybody know if another comparative year (mid-70's) KZ 400 has a center stand, and will that fit on an "S" model?

Have a look at CMSNL or Partzilla to see which other models have the same stand (pretty much all bikes of this era with the exception of trail bikes had both)