Besk
Member
It is not difficult to modify the camera back so that Horseman holders will work.You might get better answers if you added to a thread about the Goodman cameras or started a new one, vs tacking this question onto threads that are not about Goodman.
I'll remark that although RB67, Graphic 2x3, and Horseman backs all use the Graflok-type sliders to hold the back on, they're not all guaranteed to be the same dimensions in the interface to the body. I think the RB67 and Graphic 2x3 backs are very similar, but the Horseman ones are a little longer on the hinge side and may not fit all cameras designed for RB67-type. (And there is an older type of Horseman back that is much longer and wouldn't fit at all.)