It makes things a little tricky when the mower was rebadged a couple of times. Ive been able to track down a pair of housings for the 690 but comparing it to the metal unit i have there is a slight difference in the depth of the bearing. The rest comes pretty close.
CyberJack - What is the model SB you posted pics of? Its exactly the same as my mower (but red). Might help me narrow down some searches.
Also, another thread suggests the the belt is a AX35 cogged type. Easy to find by the looks of that. Part number helps.
Just realised i need a grass chute as well

Thanks for the help.