High/Low selector switch on D2

[WildOne]

Evening all,

Does anyone know what the size and pitch of the thread is on the high/low switch on the D2 transfer case? I'm gonna convert mine using a D1 housing and need to drill and tap for the H/L switch which the D1 does'nt have.

[WildOne]

I hav'nt pulled my existing housing/switch out yet and would prefer to have all the right tools/taps etc ready before i start the conversion