Just to finish the conversation on aftmkt FLCA. Emailed most to check on fitment and these are some replies:
SPL FLCA
https://www.splparts.com/products/fr...-brz-ft86.html
They replied saying they redesigned/re-specced the ball join to cater for the Alu knuckle.
Cusco FLCA.
https://www.rhdjapan.com/cusco-wide-...6-zn6-zn8.html Generic part for all gens and no report of compatibility (nor non-compatibility) with alu hub but marketed to be compatible.
P2M FLCA.
https://www.phase2motortrend.com/pro...lca1086-hc.htm they replied saying they will check fitment with the alu knuckle, cannot confirm at this time.
Hardrace FLCA.
https://www.hardracesuspension.com.a...er-control-arm looks like new part number specific for 2022 BRZ.
Megan racing FLCA https://
meganracing.com/suspension/type-suspension-arms/scion-subaru-arms/mrs-sc-0624-ii usd605
https://meganracing.com/suspension/t...-sc-0624-v2-ii
Looks like new part number specific for 2022 BRZ.
RacerX FLCA
https://racerxfabrication.com/frs-br...r-control-arms
they replied saying they will check fitment with the alu knuckle, cannot confirm at this time