Hi from Melbourne

Just bought a 1980s series I 400RB and it has been a dream of mine to own one again (I did have a 200RB that was terrific, but sold it for a reason I cannot remember...so long ago). Anyway, I found this 400RB in near perfect condition - new capacitors, clean as a whistle, everything working A1, all the original knobs etc, so I bought it.
However, it is missing the carry handle and I really would like to find one, but don't seem to be having much luck. Therefore, my question is: are these handles still available for purchase online anywhere? If possible I would like a GK handle and not a generic one that might fit. There doesn't appear to be a GK parts stockist in Australia that I have noticed.
Any ideas?