Discover the SM 55 by Metro Moulded Parts, a top-choice Firewall Grommet suitable for classics like the 1949–1955 Chevrolet Bel Air, Fleetline, Styleline, and the iconic C1 Corvette models. Known as the Throttle Rod Tube Protector or Heat Indicator Guard, this 1-3/8" outer diameter with a 7/8" inner diameter grommet is an essential piece for your vehicle’s throttle rod, oil pressure gauge pipe, and more.
Featuring a robust black finish and a sleek design, this product ensures both visual appeal and peak functionality in your engine. Expertly designed for durability, the SM 55 showcases modern rubber compounds, providing unbeatable resistance to chemicals, sunlight, and ozone. These qualities prevent early wear and deliver peace of mind for vehicle maintenance enthusiasts.
Easily installable, just align, press-fit, and let the grommet adapt perfectly to its intended place without any hitches. Enhance your vehicle's performance by choosing the SM 55’s reliability and style that lasts. Proudly backed by Metro's impressive 30-year platinum warranty—ensure a secure purchase knowing we'll replace any failures no hassle needed.
Don't delay; equip your classic Chevrolet with dependable protection today!
Customer Care
Frequently Asked Questions
Q: Is my personal information kept private? Is it safe to use my credit card?
A: Yes, your personal information is kept private and it is safe to use your credit card.
Q: How much will shipping cost?
A: Unfortunately, the cost of shipping is a real expense. Our goal is to minimize your shipping costs. Shipping is calculated at checkout based on the items in your cart and will be displayed prior to you placing an order. Please note that oversized items may be subject to additional charges, which will be noted on the product page.
Q: How do I track my order?
A: Once your order ships, you will receive a tracking notification via email. You are not required to purchase, download or use the Route app to track your order - this is an optional feature of the Route Package Protection service.
Q: Can someone outside of the United States place an order?
A: Yes, we are happy to provide worldwide service for our customers. Your shipping charges will be calculated during the checkout process. Customs and duty fees are the responsibility of the buyer.
Blog posts
Read moreThe 2027 Corvette is the story that keeps on giving right now — a brand-new engine, the return of a legendary name, and order books that are very much open. This week we'll put the 2027 highlights front and center, then run through the rest of what moved in the Corvette world. As always, this comes from folks who live and breathe these cars right alongside you.
Read moreGM hasn't shown us the C9 Corvette — but the automotive rendering community isn't waiting. We rounded up the best unofficial C9 concepts from artists like The Kyza, vburlapp, and Vengeance Graphix, and what they reveal about where fans hope the next Corvette is headed.
Read moreThe internet spent early June convinced GM had accidentally leaked the C9 Corvette in a Mary Barra interview. It didn't. Here's what that viral screenshot actually showed — and why the real story, AI-assisted Corvette design, is more interesting than the rumor.
