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Any Triumph 650 fork yokes post 1962 up to the 70s should work well.  I think most British bikes had 38mm staunchions.  Your problem might be in finding enough room for the engine and gearbox.  I cut full circle engine plates for my Tribsa.  It was a tight fit, but it all worked really well.  I think it had 19 inch wheels.  If you use 18 inch, it might handle a bit more stable.