Are these version 2? Same as chrome ones.

Yes they the same, I have both sets so, I can confirm that they're the same

Whould these fit fms fcx or furitek caymen? Thanks

They are for 1:18 scale crawlers, but they're only a few bucks, so try em out. You could probably cross reference sizes though to find out for sure. I know the hole to attach the shaft is a d-shaped hole.

Any idea if these will work with the K10 High Trail?

I use them on my K10 Monster Truck build with 59mm INJORA shocks. It's at their limit, but functional. I think INJORA just came out with a stainless steel version, specifically for the K10, on their website.

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Description

⚙️ Upgrade your RC game with precision and power!

READY TO UPGRADE - Includes 2 drive shafts and screws for a seamless installation—no batteries required, just pure mechanical power.
OPTIMIZED FOR TRX 4 M - Specifically designed for TRX4M Bronco Defender and INJORA gears, maximizing compatibility and performance.
UNMATCHED DURABILITY - Crafted from hardened steel to resist rust and wear, ensuring your RC crawler stays race-ready.
AUTHENTIC SCALE REALISM - Scaled joint diameters and splines deliver a true-to-life look that elevates your model’s authenticity.
PRECISION FIT ENGINEERING - D-shaped and rounded rectangular holes guarantee a tighter, wobble-free connection to your TRX4M drivetrain.

The INJORA Drive Shaft set features hardened steel construction with D-shaped holes for a secure fit, designed specifically for TRX4M Bronco Defender and INJORA gears. This 2-piece upgrade enhances durability, scale realism, and drivetrain performance, making it a must-have for serious 1/18 RC crawler enthusiasts.

Specifications

Product Dimensions	2.54 x 2.54 x 5.08 cm; 30 g
Item model number	4M-50BK
Educational Objective(s)	Construction Skills
Number of Game Players	1
Assembly Required	Yes
Batteries Required?	No
Batteries Included?	No
tech_spec_battery_description_toys	No batteries required
Material Type(s)	Metal
Color	Black
ASIN	B0C7GQ6MFL