WTT 700c for 650b Tires

[maxcr]

I've restarted work on my 650b projects but I don't have much in terms of tires in my parts bin so I figured I'd ask here:

Here is what I have for trade:

Tires:

My Cava UDs 700x42 (lots of tread left)

Or my Soma Shikoros 700x42 (only a few miles, like new) 

For your 650b lightweight/supple tires (Extralight Rene Herse BabyShoe pass would be ideal and I'm happy to throw $$ depending on what you have, but other supple / light tires 42-48 will do)

What do you have?

Max in Boston