I spent a long time trying to find good mounts for GameCube controllers. I came across a few 3D printed ones on Etsy, but wanted a little more quality than that. I looked at generic controller mounts, but they just don’t fit the GameCube controller well. I needed up going with these headphone holders from Amazon https://www.amazon.com/dp/B08X4LNSYZ/ref=cm_sw_r_cp_api_glt_fabc_GZXGJKX1XN24FSK4M0K0?_encoding=UTF8&psc=1