Dont know which driver to get, help please?

Okay so I have a C6 host a 300mw 405nm diode, I have the diode in the aixiz (using just the top part of it) and I just can't get it to fit into the host. The driver is just too big. This is the one I used (with the spring cut off and wires soldered on) But now I need a new driver a small one, maybe one that fits in the pill. Does anyone know where or what kind exactly should I get? Please link me if you do, thanks!!