BorgWarner T5 roll pin size

[spitfire4v8]

Hi does anyone know the correct roll pin size for the tailshaft shifter/selector shaft? The roll pin in my gearbox has fallen out because it's been hammered closed and lost it's tension.. and of course now it measures undersize on its circumference. Anyone know the original part size?
It seems to be one inch in length so suspect it's an imperial pin.

[spitfire4v8]

Thanks for that, got 2 coming from jon reid at grantura engineering .. thanks for the offer though
best wishes