I used to sell JAM engineering carb conversion kits many years ago. I just went through 3 kits and managed to assemble a perfect kit with 2 different sets of air cleaner adapters (K&N and stock filters..??) - Kit does not include the 32/36 DGAV carburetors (they never did). There are likely enough spares (pictured on top the Cannon box) to make a 2nd kit (minus 1 insulator block at the manifold and a K&N air cleaner adapter). See pics.
These were engineered for the E3 and E9 models, replacing the stock Zenith carbs with Weber DGAV (water choke) carbs. Uses the stock BMW linkage. While you can use the stock air filters with the provided adapter, the K&N filters are a little lower and less likely to contact the hood insulation foam pad.