Hi Mark,
I don't have any weight transfer squarebills currently. I asked Brian about this and he told me where to get them, but indicated that he felt the 2.5 squarebills I have in stock from another vendor are of much better quality. I didn't know he had previously offered a wt squarebill.
If this is something you would be interested in, I can see what it I can do to get some. It would probably depend on quantity