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Is there a 12" 4 Flat Extender that will Fit in the Curt Mounting Bracket for 4 Pole Flat?  

Updated 12/30/2025 | Published 11/26/2025

Question:

Is rhere a recommended 12 inch long 4-flat extension that will fit the bracket? I have a Reese extension and the plug is too large to fit the opening in the bracket

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Expert Reply:

Hello Tnf,

Since your Reese extension will not work, I would go with the Hopkins 4-Pole Loop - 12" Long # HM48145. The Hopkins has a slimmer design so it will be able to fit in the Curt Mounting Bracket for 4-Pole Flat Trailer Connector # C42CR.

What kind of trailer or accessory are you using that you need the extension?

expert reply by:
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Kate F
Kate F. profile picture
Etrailer Expert

Kate F.

12/29/2025

Hey Tnf, did the Hopkins 4-pole loop end up fitting better with your Curt bracket? Knowing how it worked with your setup could help others trying to match the same parts.

Tnf profile picture

Tnf

12/29/2025

@KateF the Curt 58380 4-flat wiring harness has good secure fit with the Curt bracket. I have been using it for over a month now and just completed a 1000 mile road-trip with no issues. Thank you.
Kate F. profile picture
Etrailer Expert

Kate F.

12/30/2025

@Tnf Glad to hear it Tnf! I appreciate you taking the time to answer. Any fun stops on that 1,000 mile trip? May 2026 bring you your greatest adventures yet!

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