The MVVS mounts look like the pic below, I have no idea about the BB Vibra-Loc though.
Mike
The MVVS is an integrated mounting system, whereas the B&B is an add-on rubber bushing. Photo attached.
It may be do-able. I have a Brison 4.8 Twin that I'd like to use it with, and as fate would have it, the spacing between two of the mounting bolts is 78mm ( the same as on the MVVS bracket). Are the MVVS mounts available thru a USA dealer, or should I ping Pe R?
Use a "HydeSoftMount" & be done with it
As far as I know, the Hyde mounts are made only for the "YS" type of 4-stroke glo engines. Are the now available for gas engines?
--Bill