Hi guys
The front axle is from a XX/XXX4, not sure of the part number but if it fits either of those cars it will fit the BJ4.
The rear axle is bespoke to the car, although a B4 one will fit and this is something I put on mine as an upgrade. The drive pin is drilled a little bit further out on the B4 axles which lets you use the blue cone washer so you can tighten the wheels without worrying about bending the drive pin or binding the bearings up.
The B44 CVA's are a direct fit front and rear, but like the B4 rear axle the B44 CVA has it's pin further out so you will need to use a cone washer too.