Your cart
Chat
Contact us
Close contact box
Connect ID #
633 133 76
Connect ID #
633 133 76
All finished with your chat session?

We’ll email you a transcript of this conversation for your records.

Our contact center is currently closed.

Please enter your name.  
Please enter a valid email address. Why is this required?

For Tech Support, call 1-888-292-2575

All web chat conversations are recorded. We use automated technology to connect you with an Advisor and to answer some common questions. If you do not consent, please do not continue with chat assistance.

Thank you, !
Our conversation will be emailed to
Chat Advisor Image

Your Advisor,

More about me
Please enter a question  
Don't wait on hold. We'll call you back when it's your turn to talk with the next available .
Please enter your name  
Please enter your phone number  
Please enter a message  

Calls may be recorded for training and quality control purposes.

We are located in Virginia USA.

Metra 40-GM21 Antenna Adapter

Works with select 1987-up General Motors vehicles — factory male to female Motorola antenna connector

Item # 12040GM21

Find what Fits your vehicle

Item # 12040GM21

In stock
C$12.99

About the Metra 40-GM21 Antenna Adapter

Metra 40-GM21 adapter

The Metra 40-GM21 adapter lets you connect an aftermarket antenna cable to the factory radio. It has a female Motorola plug on one end and a right angled male GM antenna plug on the other. This adapter can also be used when installing a wired FM modulator with the factory radio. Please enter your vehicle information or call an Advisor at 1-888-955-6000 to find out if this adapter is compatible with your vehicle. Warranty: 60 days.

What's in the box:

  • 6.438" antenna adapter cable (one end terminating in a female Motorola plug and the other end terminating in a right angled male GM antenna plug).
MFR #40-GM21

Customer reviews

Loading reviews...

Metra 40-GM21 Antenna Adapter reviews

Average review:

26 reviews

Filter by rating

Customer photos

Sort reviews

Sort by:
Items per page:
View page:

Verified customer (What's this?)
Verified employee review (What's this?)

Pros:

Cons:

Crutchfield response

<< >>

More details on the Metra 40-GM21 Antenna Adapter

Research Team

Product Research

Features

Compatibility: 1987 and later GM factory radio with mini connector to universal antenna adapter cable (factory radio to universal antenna)

Loading accessories...

Customer Q&A

Loading articles...

TOP
Compare the sound