On my 70 Roadrunner, there was no plastic piece....but my car was a wreck when I got it, so it may have been broken sometime before I owned it

70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"