I just replaced my belt on my Kobra. Here are the parts I ordered from Amazon.

Belt
Buckle

You'll need need a pair of pliers to crimp the buckle, here is a cheap pair from Amazon as well.

Pliers

Wassup dude, so I'm a mod in a Facebook group that focuses primarily on the Kobra standard. We have found replacement parts and added them to this Google doc. Along with helpful tips regarding some of the Kobras trouble points. https://docs.google.com/document/d/19IJDYukagmwTXQ_ApvPc6_TyC-kGGLNYsQa2Wi0JBJI/mobilebasic

But if you don't feel like reading through this whole guide, here are the upgraded belts and crimps that users have used to replace the stock ones.

Belts: https://www.amazon.com/Upgrade-Non-Slip-Version-Printer-Printers/dp/B08R93QQ8Z?pd_rd_w=DidBr&content-id=amzn1.sym.0fa666f9-8458-4064-8cd8-03e3608e5e74&pf_rd_p=0fa666f9-8458-4064-8cd8-03e3608e5e74&pf_rd_r=4X45K90R5DXE4X711AD4&pd_rd_wg=eceBt&pd_rd_r=00faaa54-9f63-4044-982f-f00f65171937&pd_rd_i=B08R93QQ8Z&psc=1&ref_=pd_bap_d_rp_28_t

Crimps: https://www.amazon.com/dp/B0968D2GR5?ref=ppx_yo2ov_dt_b_product_details&th=1

Good luck, and happy printing!

I got this for my replacement belt when the X axis broke and it's been working fine since.

https://www.amazon.com/gp/product/B08R93QQ8Z/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I also bought these for the clamp but I cannot recommend them as they're pretty tricky to install for this use. A zip tie or smaller clamp should work for you.

https://www.amazon.com/gp/product/B091CRQG63/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Yeah, here:

Nema 17 stepper motor mount: https://www.amazon.com/dp/B08DG2JCPY

Heatsinks: mine came with a package of stepper motor dampers that it turns out I don’t actually need. You should be able to find them on Amazon. Look for 40x40 mm and check reviews for the quality of the adhesive backing

M5x30 pan-head bolts: purchased from ebay, or you can try your local hardware store

GT2 belt: https://www.amazon.com/dp/B08R93QQ8Z

Use small zip ties for the end locks on the new belt, or pry the brass compression fittings off the original one and reuse. Zipties are working fine for me. Fold belt over on itself, teeth outward, then zip-tie as tightly as possible.

Y-axis extender: https://www.thingiverse.com/thing:3519404. (Says Ender pro, works fine for Ender 3v2)

You will also need to print a new mount for the y-axis limit switch. There are a bunch of these on thingaverse. You may need addtl hardware to mount it, check the print requirements.

This is what i have replaced mine with

https://www.amazon.com/gp/product/B08R93QQ8Z/ref=ppx\_od\_dt\_b\_asin\_title\_s00?ie=UTF8&psc=1