Quoted from LTG:https://www.pinballlife.com/25-cent-standard-coin-mech.html
The two metal studs on each side can be moved around or removed as needed, three holes on each side of the coin mech for this.
Check the top of the control panel coin slot though, if it's quarters fine, if it's dime or nickel, then you may not find mechs. See if a corner fits in the top hole thing and slides down to where the coin mech isn't.
LTG : )
Pretty sure he means "see if a quarter fits"...