There are 3 possible situations one can have. And for each, I’ll list the items needed to use the OcuLink module Josh is making.
1) Framework 16 with the Graphics Module (AMD Radeon RX 7700S) - Click to show
You brought your Framework 16 with this: Framework Laptop 16 Graphics Module (AMD Radeon RX 7700S)
You need a non-GPU Expansion Bay Shell.
You already have a Graphics Module interposer which you can use for the Oculink module.
2) Framework 16 without the Graphics Module (AMD Radeon RX 7700S) - Click to show
You brought your Framework 16 with this: a fan-only Expansion bay shell
You need a Graphics Module Interposer.
You can put the OcuLink board into the fan-only Expansion bay shell which you already have.
3) Framework 16 with the non-GPU (fan-only) module, AND in addition the Graphics Module (AMD Radeon RX 7700S) - Click to show
You would have needed to have selected both when buying your Framework 16, and paid an additional cost. Normally, only one, or the other, is included.
You have everything you need.
You can put the OcuLink board into your fan-only Expansion bay shell, and use the interposer from your graphics module, both of which you already have.