Well Ordered the chucks from ebay and it turns out that most on ebay are 7mmx.075 thread (WRONG TYPE ) which I bought.
The correct thread for my dremel and Parkside rotary tools after checking with dremel are 8mm x .075 thread.
Most of the keyless chucks that are listed on ebay are 7mm x.075 thread ... which is what I purchase (x3) but I somehow got 1 correct chuck in the 3 I orderd
A fluke ! so I have 2 chucks with the 7mm thread and 1 chuck with 8mm thread (the correct one).
So if you people got to ebay like most of us do double check your ordering the 8mmx.075 thread or like me you will end up with a few duff chucks that I have now idea what tool they will fit...
I have noticed on ebay that if you search for 8mm keyless chuck in rotary tools most the pop up cheap are the short type... so I will now order two short type and two long type (slightly more chas folks) in the correct thread (8mm x.075mm -- confirmed by dremel)