Sorry for the late entry, but I've been out of town for a couple of weeks and could not add my 2 cents -
The 2456DV pictured is off my X77, definite original, and the inner support is not swaged in place, but is spot welded as shown. This is the original finish on the pulley as well - appears to be dark grey phospate on the front side, or maybe dulled semi-flat black.
The 824BV shown is a repop. The two pulleys are different in diameter by quite a bit - no wonder the belts needed to be swapped according to My68SS -
Regards,
Steve