If the VG is a goofy size like the os .21 rg was then it should work. The
rtr .28 is a funny 6 bolt head and not standard size backplate. I put the rg backplate on mine. Would have to measure a vg to see, but I think it is the standard size rather than the bigger size like rg and the rtr engine.
The rtr engine is a good engine. Once ya get it tuned right it gets decent mileage, great power, and is a cheap engine for the longevity and performance you get from it. Good for club racing but you'd need a .21 if you go to any bigger races that tech the cars or enforce the roar rules.