I would like to buy an Aluma 8300 with the GW8G to use with my Stellarvue svx-80T, which has a .74x reducer on it. The reducer allows for 55mm backfocus and has a 48mm thread. To make this setup work, I would need the 48mm adapter for the FW8G-Aluma. I need to know how wide this adapter is. I believe the Aluma 8300 with GW8G takes up 54mm of backfocus, in which case I need the adapter to be no more than a couple of mm wide. Secondly, I see that this adapter is out of stock. Will you have it back in stock? Thanks.