I bought a used F-GT Lite racing seat and it didnt come with the shifter mount.
Made my own..
I think this will work for the normal GT Lite seat to.. But I don't have one to test.
I printed it PLA+ at 15% infill, 8 walls, 6 top/bottom layers. Certainly strong enough for the shifter.. Idk if it would be strong enough for an e-brake though.. Test at your own risk.. but the way the bracket is designed, it will use the seat mount itself as support. So it should be able to handle the "pull back" force for an e-brake.
Logi_Shifter_Mount_F-GT.STL | 436.5KB |