The speedo info I have collected on the Brum Scott, 120 mph, S433/3/L, S467/3/L. My Brum, SC3309/00.It should have the trip cable through the BOTTOM ,(many are through the side) The cable needs to be 6″long to pass through the headlamp. The chrome bezzle is the stepped (later type) ,not rounded,(pre war? ) Many other numbered Smiths Cronometric 120 MPH speedos will do the job. If you want it light it will need a bulb holder with a 3watt sbc cap ,fitted in the bottom!