MDP Firewall Engine Harness Grommet | Milspec Plate
Protect Your Cabin. Elevate Your Bay. Choose Your Perfect Fit.
The MDP Firewall Engine Harness Grommet & Milspec Plate lineup delivers a clean, professional, and functional finish for your firewall—crafted for both street cars and high-performance builds.
Whether you need a sealed grommet plate for an OEM-style harness or a larger opening for a Milspec/Rywire-style harness, we have the perfect solution for your setup.
🔥 Standard Engine Harness Grommet Plate (With Seal)
For OEM / standard-size harnesses up to ¾"
Our sealed option features a precision-machined 6061 billet aluminum plate paired with a weatherproof rear sealdesigned to keep water, debris, fumes, and heat out of the cabin. Perfect for daily-driven, show, or track setups.
Features:
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CNC-Machined 6061 Billet Aluminum — durable, clean, and high-end
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Integrated Rear Seal — blocks water and engine bay elements
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Fits Harnesses Up to ¾" — ideal for standard engine harnesses
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Complete Hardware Included — 4× M6 hex bolts + 4× M6 rivnut inserts
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Easy Install — fits most vehicles with basic tools
🔥 MDP Milspec Harness Plate (Diamond or Square)
For Rywire / Mil-Spec-style oversized connectors
Designed for builds running Mil-Spec harnesses, these plates feature a much larger opening specifically engineered for oversized connectors.
Important Note:
Milspec plates do not include a rubber seal on the backside due to the larger opening. Adding a seal would require increasing the plate diameter, which would not fit the firewall on most chassis.
Customers may use silicone, gasket maker, or preferred sealing material if a sealed finish is desired.
Milspec Plate Features:
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Larger Opening — perfect for Mil-Spec connectors
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Available in Diamond or Square
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Slim Profile by Design — ensures proper firewall fitment
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6061 Billet Aluminum construction
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Hardware included
💥 Why Choose MDP Plates?
MDP plates combine clean aesthetics, functional protection, and high-quality machining. Whether you're tucking your bay, going Milspec, or simply keeping your cabin sealed and clean—MDP delivers a next-level finish.
Upgrade Your Firewall. Upgrade Your Build.
Shop now at MDPFL.COM and choose the perfect plate for your setup.
