Any grade 12.9 or if you can do it, drill and tap it for 4mm.
Castle Neu 1520 on 6S LiPo Powered Gmaxx (Nitro Killer)
Predator with OS .21TM
Supermaxx with Mach .26
Revo with OS .18TZ
Kyosho ST-RR Conversion
Ofna CR with Tekin ESC/Motor (2)
I guess the countersunk holes are for motor screws, then it mounts with the other threaded holes?
Is there one that catches all four screws on a Medusa? They have 2 on 25mm centers, but the other two are on 19mm centers.
Yep the medusa one fits all 4 threaded holes. I have one and it fits my 60mm v2 perfectly. A very good idea, as one of the threaded holes in my motor stripped out very easily. Use the drop down menu to select the medusa model.