will this chain and sproket setup work for my bike ?

I got a 2011 sms 630 and I'm on the supersprox website and I'm gonna buy the kit on there but idk if this chain is the right one for my bike ?
Chain: RK GB 520 EXW 126
Front: 15 grooved origional
Rear: 43

Just need to kno if the chain will work cause there is like three diffrent kinds of rk chains to pick from

Yes, but it will be long.

What chain length should I get ? 116 118 120 126 116 is stock right ?

Go on gearing commander.com and put your MY bike, what gearing you run and it should tell you. U would link 114 or 116

Thanks man I apreciate it !