You should be able to get used to the girth over time. Not sure about that much length.
When I first started using toys back there, a 4.5" circumference was good, but 5" was a tight fit. Now, I thoroughly love my 7" long by 6" circ. toy
Once "warmed-up" I can fit in a 7" circ plug. On the extreme side, I've been able to accomodate a 8" circ plug, but that one still hasn't reached the "enjoyable" stage.