The handbrake lever on a Stratos is the same as an early Fiat X1/9 1300 with the addition of a s second lever (I think some X1/9's had two though). Protoypo on here will confirm. The plastic knobs are the same on both the X1/9 and the Stratos and notoriously difficult to find. Hawk Cars in the UK may be 3D printing them? I'll see if I can find out for you.
Guy
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