1983-04 Ford Mustang PCM Harness Firewall Grommet by 50resto

Mustang PCM Harness Firewall Grommet (83-04)

Details   |  Description   |  Reviews
Mustang PCM Harness Firewall Grommet (83-04)
  • Mustang PCM Harness Firewall Grommet (83-04)
  • Mustang PCM Harness Firewall Grommet (83-04)

Seal up your 83-04 Mustang's firewall with this 5.0resto PCM harness firewall grommet!

Item #LRS-14603

Everyday Low Price: $24.99

Out of Stock


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  • Replaces Damaged or Missing Grommet
  • Prevents Noise and Heat From Entering Passenger Compartment
  • Prevents Damage to PCM Harness


  • Rubber Construction
  • Black in Color
  • Oval Shape with Round Knock-out Hole for Harness

What's in the Box

  • (1) Rubber Grommet

Made in the USA

Product Description

Mustang PCM Harness Firewall Grommet
This grommet is used to seal the PCM computer harness to the firewall on most 1983-2004 Mustangs. This 5.0 Resto rubber plug will replace a missing or damaged grommet where the wiring harness passes through the bulkhead on the passenger side of the engine compartment. Don't let this little grommet be the cause of serious PCM damage on your Mustang, grab yours today!

-Fits 1983-2004 Mustang

5.0 Resto Products Limited Warranty - Click Here

Product Reviews (1)

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1 of 1 REVIEWS
1 of 1 REVIEWS

5 Stars   Excellent EFI Harness Grommet
By on 3/6/2015
Quality neoprene firewall grommet seal for just about any EFI conversion project. Late Model Restoration has everything great going for it, including great products like this and fast shipping, but they did neglect to provide the customer with the dimensions of this seal on their website. So now that I have this part in hand, the dimensions are as follows:
Firewall Hole: 3.00" L x 1.55" H (Oval hole)
Harness Hole: 0.80" ID
Overall Thickness: 1.50"
Channel Groove for Firewall: 0.20" (Max thickness of metal for firewall at hole)

I used this grommet for a retrofit engine transplant of a 2006 GM LSx engine and PCM into an custom vehicle application. The (2x) long 80-pin PCM connectors were able to fit through the oval hole dimension for the grommet at the same time, followed by snapping the grommet in place. No other grommets on the market today would accommodate passing these large PCM connectors through the firewall. Thanks to the uniqueness of this grommet, my project is a complete success!! Well done Late Model Restoration!

Yes, I would recommend this item to a friend!

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Vehicle Applications

Ford Mustang - 1983 (83) - 1984 (84) - 1985 (85) - 1986 (86) - 1987 (87) - 1988 (88) - 1989 (89) - 1990 (90) - 1991 (91) - 1992 (92) - 1993 (93)

Ford Mustang - 1994 (94) - 1995 (95) - 1996 (96) - 1997 (97) - 1998 (98) - 1999 (99) - 2000 (00) - 2001 (01) - 2002 (02) - 2003 (03) - 2004 (04)

About This Brand

50resto - Dedicated To The Preservation Of The Fox Body Mustang
50resto is your trusted source for 1979-93 Mustang Foxbody restoration products. Buy 50resto products from Latemodel Restoration Supply and receive the best value, quality and industry-leading customer service. Whether you need Fox Body Mustang weatherstrip, headlights, taillights, seals, body panels, hardware, door handles, trim parts, carpeting or upholstery, 50resto is the brand you should demand. SVE and 50resto Warranty One Year Hassle Free Replacement SVE and 50resto products are warranted to be free from defects in materials or workmanship for one year from date of purchase. What does this warranty cover? YOU! That’s right, whether you ordered a SVE brand Mach I grille delete or a 50resto brand light kit, if your product fails within a year of your purchase we got your back! Some conditions will apply.

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