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.

ASIN	B0C7GQ6MFL
Age Range Description	Kid
Battery Types	No batteries required
Brand	INJORA
Character	Bronco
Colour	Black
Customer Reviews	4.7 out of 5 stars 488 Reviews
Educational Objective	Develop manual skills and understanding of mechanical components
Indoor Outdoor Usage	Outdoor
Is Assembly Required	Yes
Item Dimensions	25 x 25 x 51 Millimeters
Item Weight	0.02 Kilograms
Manufacturer	INJORA
Manufacturer Part Number	4M-50BK
Material	Steel
Maximum Recommended age	144
Minimum Recommended age	14.00
Model Number	4M-50BK
Number of Players	1
Operation Mode	Manual
Power Source	Unpowered
Size	Petit
Theme	Vehicle
Unit Count	6.0 Count

INJORA 22g Drive Shaft Steel Black Front Rear Center Shaft with D Shaped Hole for TRX4M Defender Bronco 1/18 RC Crawler Upgrade, 2PCS

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