transfer box differences 1.2 to 1.4

well fitted the 1.4 transfer box to my disco and what a difference it makes its great, one thing I over looked mid swappage was the speedo sensor.

iv swapped the gear inside to bring it inline or as close as for my tyres (blue one)

but on the 1.4 I have put in the speed sensor is held on with a thread that's in the unit, where as the 1.2 had a bolt that went into the unit and held the black sensor in place, should these just swap straight over? or do I need to remove the thread and attach using the bolt?

hope this makes sense

remove stud from yours and fit to disco box, allen bolt is used for the transducer type speedos