I don't have the V - 12 but a word

Better to spend the time to find and order the correct tool size then to have to deal with the consequences

If you put some common duct tape on the universal it can bend but not " fall " to a 90 degree position

With all the extensions don't bother with a impact gun , ask me how I know

You can keep the long extension from sliding aft with a brick on the concrete ground

Expect to have to use a breaker bar / pipe

Asume you will have to make the electrical nuts on the solenoid before fully mounting the starter assembly