The HEIR 16 fork will fit on the Zulu Two.  But there are a couple of caveats to be aware of:The Zulu Two (standard) and Zulu Two HEIR frames are not identical.  The Zulu Two HEIR frame's headtube angle is adjusted to correct for the longer fork.  If you put an HEIR 16 fork on a Zulu Two (standard), it will slacken the head tube angle.You will need a 160mm brake rotor for the front.You can purchase the HEIR 16 fork here: HEIR Fork