correct, my 1/2 served with 4FD and 25FD, (not really relevant to this thread however)
which is in a sorry state but has some interesting fittings on the front that I have yet to find an explanation for, there are photos of mine rollers fitted in Cyprus but I remain unconvinced of that on a Mk1/2
no, the Malaysian "collar" has nothing to do with a 1/2, it was purely a local "invention"