Maybe the OP was after a Convoy S for the reason of its small size?
I had a similar request, though I did not actually need a lot of throw, I wanted a tight beam…which will result in a lot of throw…also in a small form factor.
So go and have a look at this thread
You will see links there to 5 degree reflector/ refractor /optic unit son e-bay, that do fit a S series lamp, so i have been told. Not got around to it yet, too much else to try first