I think the early ones were single speed, and I know that 1981 models in Australia were two speed - and two speed wipers were listed in the optional equipment catalogue. So the answer would seem to be it could be either one or two speed. The two speed will be a rotary switch.
There are two types of blade fitted, take one to supercheap/Repco, you may be lucky, especially if it is the later type with a hooked arm, but even then you may have trouble finding one short enough. Otherwise, any of the specialiust suppliers should have them, such as All Four X 4 for your area.
John



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