
Left Driver-Side Replacement for 2016–2018 GMC Sierra 1500 & Denali

The M40 dual-channel step up: 4K front + rear recording on a 10-inch mirror display
Check price at eBay
Universal mirror mount per the listing; front 4K + rear channel per seller spec.
Picked alongside the M40lite because buyers split on price vs. dual-channel — this is the full dual-cam version, 740 sold at sourcing.
How FMPR picks productsDrivers who want front AND rear recording with a big mirror display for backing up.
Skip it if you only need front recording — the lite mirror cam is the simpler buy.
This page is not a hands-on test, a current-price claim, or a guarantee that the product fits your exact vehicle.
eBay and the seller control price, tax, stock, variations, shipping, returns, and final compatibility information.
Check price at eBayFMPR is a member of the eBay Partner Network. We may earn a commission on qualifying purchases made through links on this page.
Listing details last checked Oct 19, 2026
This listing is included for its documented use context. It is not a hands-on test, best-price claim, rating claim, or performance guarantee.
Dual-channel means routing a rear cable the length of the vehicle — plan the install path, and confirm what memory card the bundle includes.
Universal mirror mount per the listing; front 4K + rear channel per seller spec.
The M40 dual-channel step up: 4K front + rear recording on a 10-inch mirror display. eBay and the seller control final variations, price, availability, checkout, shipping, fulfillment, and returns.

Left Driver-Side Replacement for 2016–2018 GMC Sierra 1500 & Denali

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