I’m sure there’s a thread on here about Yamaha players having to contend with having smaller nuts? ?
There are some interesting Yamaha bits on Premier kits of the era. The 3000/4000 cymbal stands are a good example of this. They're Yamaha cymbal stands but with Premier specific legs. The bottom assembly of APK/XPK/Projector etc of that period bass drum spur is also shared with the Yamaha 8000 kit, with the reversible spike.