Sorry to say the later BDR axles are a secret part number. I'd contact the Driveshaft shop as they have upgraded those for some folks and may share the part number or application with you.
This thread has some details.
Broke a half shaft backdraft
These may work for you. The CVS-33 boot goes up to 125mm and your 4.43" = 122.522mm.
https://www.stretchcvboot.com/cv-boots/