A little extra info. Looking at Advance Auto Parts pictures, the 89 and the 92 forerunner both use S12W calipers.
According to my EBC Master parts list, the
89 uses FMSI D436, which is 119x64x15mm
92 uses FMSI D502, which is 119x72x15mm
The 300zx
uses FMSI D647, which is 120x70x14mm
SO the 89 has 7616 sq mm of pad surface
The 92 pad has 8568 sq mm
and the Z pad has 8400 sq mm.
The 92 pad has the most surface area and is an extra 1mm thick.
Interesting to see that they all interchange though.