Random stuff.
http://ccmodels.com/shop/michigan-t-24-conversion-kit/ was available 2009 for $325. Looks like it had crawler tracks, dragline bucket, main boom extension, secondary boom, grapple claw, a bent boom, extra top rigging, third crank drum... in brass, based off michigan factory info. And to be helpful it's! not available, and the pictures are ms-paint.
Truckmaker was kind enough to tell me his trucks aftermarket boom extension was 15" OAL, pin holes 14_3/4 centers. He also shared some detail pics.
It looks like they designated t-24 for truck mounted, c-24 for crawler. And i'm not having much luck learning about the cranes, or the michigan company, or clark who bought them, but there's some goofy looking bird that shows up in every search.