The Kyosho OT-16 parts bag contains the front knuckles (‘knuckle arms’) for the Lazer ZX range.

with OT-4, OT-19 and OT-17
Over the years, they have been changed from metal to plastic. There has also been a part marked ‘V’ and a part marked ‘VB’, with minor differences

Alternatives
The OT-211 is virtually the same part but right and left are reversed, while the steering ball (5.8mm) needs to be a M3 thread instead of a 2.6 mm one.

for the re-release Optima
The SD-32 part is listed as compatible on the Kyosho website, which is for the Spada range.
