you have 2 choices GM or FAI
personally i went with GM as i know its been on there 10 years 55k with no issues and i had the money for it
the main chain and balancer chain could be either fai or gm there are a very close approximation of each other and i have fitted both with no reported problems while fitting
i alway recommend the z22se shop its a great service and you get what you pay for
main chain
gm
https://www.z22se.co.uk/shop/timing-chain-kits/z22se-timing-chain-kit
fai
https://www.z22se.co.uk/shop/timing-chain-kits/fai-z22se-timing-chain-kit-ng
balancer chain
gm
https://www.z22se.co.uk/shop/timing-chain-kits/balance-chain-kit
fai
https://www.z22se.co.uk/shop/timing-chain-kits/fai-balance-chain-kit-wo
gm for a pair of chains = £323
fai for a pair of chains = £185
broken engine = £700-800 🙂
you could mix it up and get the gm main chain and the fai balancer chain £246