Hi,
The 232 and Bellset 26 (or other bellset such as Bellset no1, for instance) were intended to be used as a pair, with the bellset either mounted seperately or underneath the telephone, I am not sure if there was an adapter to allow the fitting of the bellset to the telephone though.
To get back to your original question, spade terminals are availble from Maplins but would have to be soldered on to any line cord that you intended to use.
Suitable line cords can often be found on e Bay
Much more information can be found about the 232 and bellset, including wiring details
here and
here
Regards
Andrew