@RoarLiana- Hi took a look at your stretching choice and thought I'd share my experience with this toy as I have one.
It was called the Doc Johnson Intimidator but is the same one you were interested in. It's really built like its ultimately 11" tall and has an 11" max circumference minus the base dimension which would 3 1/2" diameter if fully inserted-
What is important to note (I took these dimensions hopefully so you can see whether it will work for you now)
The head on top is 1 13/16" diameter
5 inches inserted is just shy of 2" diameter
6" inches inserted is 2 5/16" diameter
7" inches is just shy of 2 5/8" diameter - so from what you wrote you can probably do now if the lenght isn't to much
8" inches is just shy of 2 13/16"diameter and that is the 5th band up from the bottom (the big base ring makes 6)
9" inches is 3 3/16"
10" inches is the big prize and is just a bit less than the 3 1/2" promised by 1/32" promised by Doc Johnson-
If you put it in upside down it is a 4" diameter- caution
It also came with a mounting hole predrilled in the center-