How much longer do the bolts need to be in order to work on a Z71?

The bolts are fine. Pretty sure you won't be able to use the front skid plate for z71. And use the instructions for same kit made by rough country. Can down load from there website

Will these fit for a 2008 silverado with a 7.5 inch lift? cant quit chewing through cv axles

I used these on a 2013 Tahoe with a 7.5 RC lift. It fit and helped out my cv angle and the extra drop did not make my CV joints bind at full compression. However I did have to drop the front of my skid pan with some 1/4 spacers for just a little for clearance bc the chunk was just touching the skid pan on the front side. Maybe that helps

Do these spacers go between the diff bracket and fame or between the diff and diff bracket?

Between the diff bracket and frame. It drops the whole bracket down

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MZS Differential Drop Kit, Diff Drop Spacers Hardware Compatible with 2007-2021 Silverado 1500 4WD / 2007-2021 Sierra 1500 4WD CNC Machined

MZS Differential Drop Kit, Diff Drop Spacers Hardware Compatible with 2007-2021 Silverado 1500 4WD / 2007-2021 Sierra 1500 4WD CNC Machined

Product ID: 415855887

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📏Fits 2007-2021 Silverado & Sierra 1500 4WD (6-lug only)

🔩Bolt-on installation, no special tools

⚙️CNC machined T6 billet aluminum

Description

🚙 Elevate your 4WD game with precision and ease!

OPTIMIZED FITMENT - Specifically engineered for 6-lug 2007-2021 Silverado and Sierra 1500 4WD models, ensuring perfect compatibility.
ENHANCED RIDE QUALITY - Reduces vibrations and improves axle alignment to extend CV joint life and deliver smoother drives.
EFFORTLESS INSTALLATION - Bolt-on design lets you upgrade your suspension in 1-2 hours without any special tools—get back on the road faster.
PRECISION CNC MACHINING - Crafted from durable, corrosion-resistant T6 billet aluminum for unmatched strength and longevity.
PRO TIP FOR PEAK PERFORMANCE - Alignment recommended post-installation to maximize handling and suspension benefits.

The MZS Differential Drop Kit is a premium CNC machined T6 billet aluminum spacer designed to improve axle alignment and reduce vibrations on 6-lug 2007-2021 Silverado and Sierra 1500 4WD trucks. Featuring a simple bolt-on installation with no special tools required, this kit enhances ride quality and extends CV joint life, making it a must-have upgrade for serious truck enthusiasts.

Specifications

Manufacturer	MZS
Brand	MZS
Model	Differential drop kit 05
Item Weight	1.85 pounds
Package Dimensions	7.64 x 2.87 x 2.44 inches
Item model number	Diff drop spacer 05
Exterior	Smooth
Manufacturer Part Number	‎005 Differential Drop Kit
Position	Front
Special Features	MZS differential drop kit are easy bolt-on installation in 1-2 hours without special tools, MZS Differential Drop Kit fits 2007-2021 Silverado 1500 4x4,2007-2021 Sierra 1500 4x4., MZS is a professional supplier who always supply high quality vehicle accessories.Providing the best service and innovative technology always are our pursuing.Once you run into any problem,please feel free to MESSAGE us.

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