Tubus Disco is a relatively tall rack, and the one pictured is likely the taller (405mm) 700c version. The 26" Disco is 30mm shorter (375mm), which should still clear a fendered 650B wheel. Mounting a 26" Disco directly to axle will close the gap between rack top and wheel. Tubus racks can be purchased from Euro sellers and shipped to USA.

https://www.tubus.com/product.php?xn=10

https://www.tubus.com/documents/1323681373_Disco_BM.pdf

Tubus Cargo Classic 26" (362mm) will fit some 700c fendered bikes (my Surly Disc Trucker for example), and should also clear a smaller diameter fendered 650B wheel.

https://www.tubus.com/product.php?xn=1

https://www.tubus.com/documents/1336...Classic_BM.pdf

Tubus Logo Classic 26" (370mm) is a bit taller than Cargo 26", but features a secondary rail 65mm below top rail, which should fit a fendered 650B wheel while carrying panniers at lowest point possible on a Tubus rack.

https://www.tubus.com/product.php?xn=2

https://www.tubus.com/documents/1324...c_Titan_BM.pdf

Old Man Mountain makes racks which attach to skewer, these may work for front of your bike.

http://www.oldmanmountain.com/catego...SH-F-27-5.html