




my cousin's 2021 23zx uses gsa tabs and all the '21's I have seen have gsa. tige forums listed earlier this year that tige switched to their own tabs on the reintroduced z3 hull but as of spring were still using gsa on everything else. looks like they switched mid year '21 and you're right, tabs look similar to the old taps3 tabs only have sides on them like gsa but missing the vertical fins at the end.
sure the TO forum will light up with comments once people have time on them. there will be gsa tabs for sale from people thinking the new tabs are better than gsa but my guess is as you commented, ditching gsa and moving in-house are financial in nature, not because their new tabs are "game changing".
'06 Supra Launch 20SSV-gone but never forgotten