That sucks.
My stupid transmission did the same thing basically. Top half went then the bottom.
Anyways if you look thru the website you dont see much in the way of dead 5600's. EEP, standard transmission, and i believe bluementhal all do conversions.
I know EEP includes small parts as I asked for a quote from them and it was all in there. Also with this swap you have to lengthen the front driveline(if 4x4) approx one foot and shorten the rear likewise. Something else to consider.
I put mine back together and it has been holding fine, if I would have swapped them out the first time it grenaded I would have almost saved money, but there was no way to ship it here to me. 70# limit.
Good luck to you