KS Lev bar bracket

I've got a Lev dropper post with the southpaw lever mounted on a SRAM matchmaker clamp. The lever is too far to the outside and rests on the outside of my thumb when riding. I'd like to change it for a bar clamp to move it inboard.

I bought one on ebay like this:

but the bolt is too big to go through the lever - it needs to take a smaller bolt like this:

Are these clamps available as spares? I asked Ison but they pointed me at the first option which doesn't fit. I'd rather not spend £50 on a full lever! Thanks!