There are round X-Boost™, but it comes in 2 sizes and you have to figure out which one you need. C6 I
think is 16mm, but I'm not 100% on that, maybe somebody else can chime in. The round ones go out of
stock frequently, so you can also get what is called a contact board and solder a square driver to that.
The thing about the X-Boost™ is that they NEED a heatsink on the driver chip itself or else it will smoke.