The "rose diameter" of the bulb holder is 2.52", the terminal box is 65mm - Google suggests that these are close to being the same measurements, which makes me somewhat hopeful that this would work.
I'd be fairly confident the screw will fit as it's a standard mounting method, albeit not the prettiest. These things tend to be surprisingly congruent IME. Worse comes to worst, you'll only be out about £3 in materials, lol.
The "rose diameter" of the bulb holder is 2.52", the terminal box is 65mm - Google suggests that these are close to being the same measurements, which makes me somewhat hopeful that this would work.