LONG(center to center = 27.43mm/1.080") O.S. .10-.18 CV,FP,LA&FSR K&B .18 (bolt through) Magnum XLS.15 MDS .18 FS Pro Enya .11CX Thunder Tiger GP .10-.15 (screws 4/40 x 1 1/4" fillister head) Super Tiger.18 Inboard Engine (the mounting of this motor hasn't been verified - any help would be appreciated)