Plug for Massodex timer

Does anyone know of a source of miniature 3-pin plugs 240vac that would fit into the enlarger socket of a Massodex SST 250 timer\?
The pin pitch is around 10mm and the earth port has a kit to prevent misalignment
Attached is a image of the item
[Yes, I can [and have] jury rig a connection , but before that I'd like to be able to source a plug
regards
Tony

That looks like an XLR audio socket.....maybe an unshrouded male plug would fit?

Mike