15 exceed seat help

It's time to move the boy up to the next size seat and having trouble mounting it so he can see, went from a junior large to an adult medium with padding, problem is he has a very short mid section so with the seat mounted in preferred measurement he cant see over the steering wheel, can't really lower the wheel anymore can't get his legs past, anyone have any suggestions on this?
 
Proper size seat is important.
If you have to use that seat theres no choice except moving it to where the driver can see .
 
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