Product Description
1974-78 Mustang USA-630 4-Speaker Stereo Package
This 1974-78 Mustang 4-speaker stereo package pairs a Custom Autosound 1974-78 Mustang USA-630 Radio with UNDERCOVER II enclosures plus Custom Autosound 6x9 dual voice coil speakers so front-stage and rear-fill hardware ship together. The radio is built for the original Mustang opening—no dash cutting for a modern aftermarket DIN chassis—and the included speakers match how many restorers finish a complete cabin upgrade. Shoppers who want a cleaner cart and a clearer bill of materials use packages like this instead of hunting each piece separately.
What is included
- 1974-78 Mustang USA-630 Radio
- Custom Autosound UNDERCOVER II Upgrade Speaker Enclosures
- Custom Autosound 6x9 Dual Voice Coil Speakers
Every line item in this package is a product Vintage Car Radio already stocks as a stand-alone SKU. Buying the package simply groups the radio and speakers under one product page with a package price that reflects a modest savings versus adding each item to the cart on its own. Individual product pages for the radio and speakers stay live if you prefer to mix and match later.
Four-speaker Mustang II package
Pairing UNDERCOVER II with Custom Autosound 6x9 dual voice coil speakers gives 1974–1978 Mustang owners front-stage and rear-fill hardware with the USA-630 radio in one checkout. Confirm speaker locations and wiring before you cut or splice.
Stocked components only
This four-speaker package uses the same radio, Undercover II, and 6x9 SKUs we sell stand-alone—no fictional amp kits—so fulfillment stays straightforward.
Custom Autosound radio highlights
The USA-630 for 1974-78 Mustang is Custom Autosound’s classic in-dash workhorse: AM/FM with modern electronics behind a period-correct face, auxiliary input for phones or players, solid built-in power for a starter speaker set, and the same no-dash-cut philosophy as the rest of the USA line. Many owners start here and add Bluetooth via an accessory or step up to a USA-740 or USA-850 later. In this package the radio is already paired with speakers so the first drive after install is not mono dash speaker disappointment.
Speakers in this package
Custom Autosound UNDERCOVER II Upgrade Speaker Enclosures handle the primary stereo pair, while Custom Autosound 6x9 Dual Voice Coil Speakers add rear or package-tray fill common on classic Mustang restorations. Dual voice coil 6x9 designs help when you are driving radio output into multiple speaker locations—confirm wiring against the radio manual before you terminate connections. Together they give clearer vocals, better imaging than a single dash speaker, and a path to add an amplifier later using the radio’s preamp outputs when offered.
Fitment and shopping notes
Confirm your Mustang falls in the 1974-78 range listed in the title. Factory air, console, and prior radio cutouts can change how speakers mount; the product options on the radio (such as factory air when offered) still apply when this package ships the same radio SKU. If you already own speakers or only need the radio, use the stand-alone radio page instead of this package so you are not paying for hardware you will not use.
Warranty and support
Custom Autosound radios in this package are backed by the manufacturer’s 2-year warranty. Speakers carry their own brand coverage as listed on each component page. Vintage Car Radio does not offer installation services; we supply the products and can help you choose the right combination over the phone. Call 844-802-4499 with questions about fitment, Bluetooth features, or whether a different radio model belongs in your Mustang before you check out.
Why order a package
Competitors lean hard on vehicle-specific stereo kits because shoppers search for complete solutions—radio plus speakers—for a given year and model. This 1974-78 Mustang USA-630 package answers that intent with real catalog components, a single checkout line, and SEO-friendly naming that matches how enthusiasts describe the upgrade. Keep browsing related radios and speakers on the site if you want to compare USA-230, USA-630, USA-740, and USA-850 feature sets side by side, then come back to the package when you are ready for the bundled set.
