You need to have a "Kidztech 1/6 Yamaha" or "TopMAZ 1/6 Yamaha" (see pictures)
You WILL have to cut parts of it and add hobby grade electronics for this to work.
This is NOT a complete model.

These days, the color has changed, but the base remains the same.
There is a orange/blue, a red/black and a grey/black Kidztech models now.
They all work for these mods !

If you need a replacement bulkhead that will fit without any mods see here : https://www.thingiverse.com/thing:3265111

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UPDATES

APRIL 2019
Pascal made his files available for the Polaris:
https://www.thingiverse.com/thing:3581090
THANK YOU PASCAL !! :D

Dec. 2019
I made a Power Claw track remix. The paddles are 2mm shorter than Pascal's original track for more tunnel clearance.This will be more suitable for a Yamaha / Arctic Cat sled since they come with them from the factory.

Feb. 2020
I posted a simple gearbox in the remix tab, for use with 540 and 380 motors.
https://www.thingiverse.com/thing:4183647

March 2nd 2020
I posted a front sprocket with FAT teeth, less chance of breaking them. (Thanks J.D. !)
Also check out the REMIX page for more accessories !
https://www.thingiverse.com/thing:3432547/remixes

March 18 2020
I added some scale lower and upper A-arms.Looks nicer and has better shock angle.
Scale_Upper_Aarm_Left.stl
Scale_Lower_Aarm_Left.stl
(Mirror the files in your slicer to get the right side)

Dec 11 2020
I removed some old files that weren't needed, uploaded a new front sprocket bearing spacer and put the snocross plates as a remix since they are not needed to complete the model. Edited descriptions to add and remove some details.

Dec 19 2020
Updated the pictures for the track mounting position. Since Thingiverse now only allows 500kb pictures here is a direct link to the big ones so you can see better :
https://ibb.co/VmqKYxG
https://ibb.co/5FXgr4f

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Required Parts :

• (2x) 8x14x4mm bearings (for the front drive sprocket)
• (36x) individual track parts to make a complete track.
• The rod-end i used are Traxxas TRA1942.
• Shocks: Dromida 1/18 scale shocks fit both the track and front suspension. RC4WD scale 80mm shocks can fit but they are very bouncy since they can't really hold oil. My exact shocks i now use are Hot Racing DMD62DP03 (Track) and ECE56DP06 (Front).
• All the bolts and nuts are M3, mostly M3x16 but some M3x12 and M3x20.
• You will also need some M3 all-thread rods cut to lenght for the front track suspension mount to chassis and rear track upper idler wheels to chassis, M3 bolts of that length don't seem to exist or are very hard to source, but all-thread is common and cheap. US guys could probably use some 4-40 all-thread instead.

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Notes :

• With "promod_bigshock_upper_Aarm" you should be able to fit up to 15mm diameter shocks !
• Use "promod_bulkhead_higher_shock_mount" for longer shocks (Should help fit shocks up to 90mm or 100mm with limiters) !
• To fit the long track conversion, you will need to remove the factory On/Off switch from under the seat and grind the white plastic hump underneath flat, or your track will rub on it.

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Dec.2020 : Wow, almost 10,000 downloads! Glad you guys like this! If you wanna thank me, make a donation to my paypal, any amount will be very appreciated, even 1$! :)