DEL has the DDm-L4 rev01 board here: DEL's OSH-Park driver boards, but it’s a bare board. I don’t know if you can get them fabricated. Here is a thread where another driver for the L4 is mentioned: The Convoy meLd 4 (Modified Convoy L4 with RGBW and MELD driver). I know nothing about these drivers though, no clue which firmware works with what, hopefully someone else can chime in.