Help me identify this brake drum

My brake shop was test driving my car and the wheel came off damaging the brake drum (among other things) and he couldn't find a replacement. The axle is a "489" 8 3/4 with 10" brakes and 5x4.5 bolt pattern axles.

This is the drum after the accident:



They tried to "fix" it, but it must be warped or damaged some how because it drags really badly on one spot.

Here is the outside diameter:



The internal width:



The external width:



And here is a shot of the outside:



I don't know where this axle came from originally, so I can't look it up by application and the shop tried about 8 different drums and never found the right one, so I don't know really where to start. Thanks for the help.