There was 2 versions of the AR44 axle for the SCX10.2, they started with what @slick2500 has, where the center axle housing can be used front or rear, depending if you mount c-hubs or the bearing holder on the sides.
They then moved to the "single piece" design later on which has those pieces integrated into the axle housing, so it's 2 different parts now. I Iike the single piece design better as it's simpler, but both are interchangeable, the mounting locations are the same and also they use the same internals.
Your metal axle is the older design, so if you want to use it on the front you need to add both the c-hubs and the link mounts from the modular version, but they should fit fine.