Hi Andy,
I have a 1950 data book from Solex and for the Crossley 4x4 with 30/100 engine. The carb is a 46RZI, choke is 38, main jet is 205, correction jet 210, pilot jet 75, GA jet is 7, GS jet 175, well is 7mm, Ass. is 20, E tube or Jet cap. is 51569/L2, MPH 41, RPM 2,500, Specification Record No. S.964
There is a slight variant on this one for the Crossley 4x4 RAF fire tender.